小数乘除法计算题2010-02-07 09:24乘法：

5.6×2.9

3.77×1.8

0.02×96

5.22×0.3

9.99×0.02

4.67×0.9

5×2.44

1.666×6.1

9.432×0.002

5.6×6.5

4.88×2.9

5.61×4.3

8.9×2.4

5.5×55

9.77×0.02

1.384×5.1

8.78×83

2.6×61

0.059×0.2

4.268×1.7

57×5.7

9.46×2.85

17.8×6.4

1.5×4.9

2.5×0.88

5.555×5.2

2.22×3.33

7.658×85

36.02×0.3

56.78×8

除法：

85.44÷16

42.84÷7

101.7÷9

67.5÷15

230.4÷6

21.24÷36

0.736÷23

43.5÷12

35.21÷7

39.6÷24

6.21÷0.03

210÷1.4

51.3÷0.27

91.2÷3.8

0.756÷0.18

0.66÷0.3

11.97÷1.5

69.6÷2.9

38.4÷0.8

15÷0.06

（循环小数的用简便方法，除不尽保留2位小数）：

8.2÷0.12

0.8÷0.9

76.4÷5.4

4.7÷3

1.25÷1.2

32÷42

14.36÷2.7

8.33÷6.2

1.7÷0.03

2.41÷0.7

用竖式计算

0.396÷1.2= 0.756÷0.36= 15.6×13=

0.18×15= 0.025×14= 3.06×36=

0.04×0.12＝ 3.84×2.6≈ 5.76×3＝ （保留一位小数）

7.15×22 90.75÷3.3 3.68×0.25

16.9÷0.13 1.55÷3.9 3.7×0.016

13.76×0.8= 5.2×0.6 8.4×1.3

6.4×0.5 4.48×0.4 5.25×5

35.4×4.2 0.042×0.54 0.76×0.32

0.25×0.046 2.52×3.4 1.08×25

0.12×0.5×0.16＝ 4.8×0.25＝ 0.125×1.4≈（保留两位小数）

2.5÷0.7= （保留三位小数） 10.1÷3.3= （商用循环小数）

10.75÷12.5= （用乘法验算） 3.25×9.04= （用除法验算）

3、脱式计算（能简算的要简算）

2.5×7.1×4 16.12×99＋16.12 5.2×0.9＋0.9

7.28×99+7.28 4.3×50×0.2 64－2.64×0.5

26×15.7＋15.7×24 (2.275 ＋0.625)×0.28

3.94+34.3×0.2 1.2×(9.6÷2.4)÷4.8

8.9×1.1×4.7 2.7×5.4×3.9 3.6×9.85-5.46

8.05×3.4+7.6 6.58×4.5×0.9 2.8×0.5+1.58

32＋4.9－0.9 4.8－4.8×0.5 (1.25－0.125)×8

4.8×100.1 56.5×99＋56.5 7.09×10.8－0.8×7.09

4.85 + 0.35 ÷ 1.4

8.7 × 17.4 - 8.7 × 7.4

12.5×0.4×2.5×8 0.87×3.16+4.64 9.5×101

0.68 ÷（5.2 -3.5）× 1.25

40.5 ÷ 0.81 × 0.18 4.8 ×（15 ÷ 2.4）

6.81+6.81×99 0.25×185×40 4.4×0.8－3.4×0.8

(9.37+9．37+9．37+9．37)× 2．5

2.37×6.3+2.37×3.7 2.5×1.25×0.32 3.8×10.1

2.5×(3.8×0.04) 7.69×101 3.8×10.1

0.25×39+0.25 0.125×72 46×0.33+54×0.33

(8×5.27) ×1.25 6.81+6.81×99 0.25×185×40

6.8×0.75÷0.5 3.75÷0.125–2.75 1.53+23.4÷7.2

9.5×99 13.5×0.98 12.5×8.8

二、解方程：

54-X=24 7X=49 126÷X=42

13+A=28.5 2.4X=26.4 7.5x－3x=18

5×1.3-2x=5.5 24x+6x=63.6 5.6x+4.4x=5.2

x＋3.86=5.46

17.89－x=12.89

40.8＋x=57.3

x－3.25=16

2x＋0.82＝8.2

3＋0.5x＝7

7.8÷x＝2.6

80x÷4＝12

5－0.9x＝2.75

2x＋0.4x=48

6－2x＋6x=18

35x＋13x=9.6

0.52×5－4x=0.6

0.7(x＋0.9)=42

1.3x＋2.4×3=12.4

3.5x = 140

2x +5 = 40

15x+6x = 168

5x＋1.5 = 4.5

13.7—x = 5.29

4.2 × 3—3x = 5.1 (写出检验过程)

20.5－4x=8.1

3.6x÷1.2=9.75

18×1.5－1.7x=13.4

18.5x－9.9x=1.721

9.2x+1.5x=32.1

7.2×5－8x=11.2

4x＋3×0.7＝6.5

(口算)

0.6×1.2= 0.84÷0.6= 4.5×0.1=

15×0.4= 0.1×0.5= 2.8÷7=

100÷0.01= 1.4×3= 0.72÷8=

6÷0.03= 0.5×0.6= 40×0.9=

4÷0.5= 7×2.1= 8.89+0.1=

24×0.25= 0.1÷0.01= 2.4×0.8=

9×0.4= 10×0.01= 30.2-3.02=

4.3-0.25= 1-0.82= 9.6÷0.3=

2.6×0.01= 0×25.4= 4.8×0.4=

7.2＋2.8=

12×2.5＝

2.63＋0.37＝

0.7×16－16×0.2=

0.96÷0.3＝

1.5－4.5=

2.5×0.4

1.4×2.5×4＝

8－2.5＝

6÷1.2=

9.2÷2.3=

24÷4＋56÷4＝

0.36＋0.64＝

4÷0.25=

1.8×5=

30×（200＋3）＝

8.4÷4.2=

8×1.5＝

4.8÷0.3=

2.73＋1.5×4＝

计算下面各题(能简算的要简算)

7.05×23.7+7.05×76.3

0.125×3.2×2.5

12.81－(1.5+7.81)

8.7×2.6+6.4×8.7+8.7

1025－1125÷4.5×3.6

12.25－3.1＋0.85－6.17

（1.9－1.9×0.9）÷（3.8－2.8）

2.65×1.7＋1.35×1.7

列竖式计算，得数保留一位小数。

1.2×1.4＝ 0.37×8.4＝ 3.14×2.8＝

0.85×1.12＝ 0.86×5.4＝ 0.15×2.34＝

40÷14＝ 26.37÷31＝ 45.5÷38＝

1560÷35＝ 4.8÷2.3＝ 1.55÷3.9＝

7.2÷2.1＝ 3.87÷7＝ 146.4÷13＝

5.63÷6.1＝ 2.84×0.03＝ 0.38×0.13＝

26.37÷31＝ 32÷42＝ 2.84×0.03＝

4.8÷23＝ 0.382×0.13＝ 4.2÷4.5＝

列竖式计算

1.64＋2.35= 8.65－6.31= 28.448÷14= 0.58×250= 12.5＋3.6= 10.88÷34= 10－7.64= 1.86×7= 13.88－6.29= 926×0.15= 8÷500= 26.3＋7.93= 23×7.06= 100.2－2.28= 44÷9（精确到百分位）

三、计算（能简便的用简便方法计算）

8×25×1．25×16

4．04×250

45．55－（6．82＋15．55）

3．2×99＋3．2 4.8×39＋61×4．8 34．52－17．87－12．23

2．5×56+4．5×65 489×101－489 4．57+3．17+3．43+5．83

4．6×56＋48×4．6－4．6×4

竖式计算：

18÷24= 43.68÷26= 25.3÷0.88=

0.1575÷3.15= 0.612÷1.8= 16.787÷0.28

（保留一位小数）

1、 算下面各题

2.36×0.22 2.8×4.58 3.57÷4.2 82.8÷36

45×2.46 3.6÷0.24 382.5÷45 6.4×5.48

2、 简便计算

3.6×2.5+7.5×3.6 2.5×1.2 0.125×32 4.3×0.9 6.5×102 3.25×99+3.25

18÷24= 43.68÷26= 25.3÷0.88=

0.1575÷3.15= 0.612÷1.8= 16.787÷0.28

31.72÷6.1×2.3脱式计算怎么算

1. 0.4×125×25×0.8 =（0.4×25）×（125×0.8）=10×100=1000?

2. 1.25×（8+10）=1.25×8+1.25×10 =10+12.5=22.5?

3.9123-（123+8.8）=9123-123-8.8=9000-8.8=8991.2?

4.1.24×8.3+8.3×1.76 =8.3×（1.24+1.76） =8.3×3=24.9?

5.9999×1001

=9999×（1000+1）

=9999×1000+9999×1

=10008999?

6. 14.8×6.3-6.3×6.5＋8.3×3.7

=（14.8-6.5）×6.3＋8.3×3.7

=8.3×6.3+8.3×3.7

=8.3×（6.3＋3.7）

=8.3×10

=83?

7. 1.24+0.78+8.76

=（1.24+8.76）+0.78

=10+0.78

=10.78?

8. 933-157-43 =933-（157+43） =933-200 =733?

9. 4821-998

=4821-1000+22=3823?

10. 32×125×25

=4×8×125×25

=（4×25）×（8×125）

=100×1000

=100000 9048÷26

=（2600+2600+2600+1248）÷26

=2600÷26+2600÷26+2600÷26+1248÷26

=100+100+100+48

=348

11. 2881÷ 43

=（1290+1591）÷ 43

=1290÷43+1591÷43

=30+37 =67 3.2×42.3×3.75-12.5×0.423×16

=3.2×42.3×3.75-1.25×42.3×1.6

=42.3×(3.2×3.75-1.25×1.6)

=42.3×(4×0.8×3.75-1.25×4×0.4)

=42.3×(4×0.4×2×3.75-1.25×4×0.4)

=42.3×(4x0.4x7.5-1.25x4x0.4)

=42.3×[4×0.4×(7.5-1.25)]

=42.3×[4×0.4×6.25]

=42.3×(4×2.5) =423

12. 1.8+18÷1.5-0.5×0.3 =1.8+12-0.15=13.8-0.15 =13.65?

13. 6.5×8+3.5×8-47 =52+28-47 =80-47 =33 (80-9.8)×5分之2-1.32 =70.2X2/5-1.32=28.08-1.32 =26.76?

14. 8×7分之4÷[1÷(3.2-2.95)] =8×4/7÷[1÷0.25]=8×4/7÷4 ?=8/7?

15. 2700×（506－499）÷900 =2700×7÷900 =18900÷900 =21?

16. 33.02－（148.4－90.85）÷2.5=33.02－57.55÷2.3=33.02－23.02=10?

17. （1÷1－1）÷5.1 =（1－1）÷5.1 =0÷5.1 =0?

18. 18.1＋（3－0.299÷0.23）×1=18.1＋1.7×1 =18.1＋1.7 =19.8

19. ?9000÷72×(1.25×0.7×8)=9000÷72×7=125×7=875

20. 61-(1.25+2.5×0.7)=61-3=58

21. [(10-0.8)+9.85]-2÷0.125=19.05-2÷0.125=19.05-16=13.05

22. 5.4÷1.8+240×1.5=3+360=363

23. 9000÷72×(1.25×0.7×8）=9000÷72×7=125×7=875

24. 61-(1.25+2.5×0.7)=61-3=58

25. [(10-0.8)+9.85]-2÷0.125=19.05-2÷0.125=19.05-16=3.05

26. 408－12×24= 408 - 288= 120

27. （46＋28）×60= 74 x 60= 4440

28. 42×50－17 = 2100- 17 = 2083

29. 32＋105÷5 = 32 + 21= 53

30. 420×（327－238） = 420 x 89 = 37380

31. (4121+2389)÷7 = 6510 ÷7 = 930

32. 3.416÷（0.016×35） = 3.416 ÷0.56 = 6.1

33. 0.8×[(10－6.76)÷1.2] = 0.8 x(3.24÷1.2) = 0.8 x 2.7 = 2.16

34. 5.67×0.2-0.62 = 1.134-0.62 = 0.514

35.0.4×0.7×0.25 = 0.4 x 0.2 5 x 0.7 = 0.1 x 0.7 = 0.07

36. 0.78+5.436+1 = 6.216 +1 = 7.216

37. 30.8÷[14－(9.85＋1.07)] = 30.8 ÷ (14 - 10.92) = 30.8÷3.08 = 10

38. [60－(9.5＋28.9)]÷0.18 = (60- 38.4)÷0.18 = 21.6 ÷0.18 = 120

39. 2.881÷0.43－0.24×3.5 = 6.7 - 0.24 x3.5 = 6.7 - 0.84 = 5.86

40. 20×[(2.44－1.8)÷0.4＋0.15] = 20x (0.64 ÷0.4 +0.15)= 20x(1.6 +0.15) = 20 x1.75 = 35

41. 28-(3.4+1.25×2.4) = 28 - (3.4 + 3) = 28 - 6.4 = 21.6

42. 2.55×7.1+2.45×7.1 = (2.55 + 2.45) x7.1 = 5 x7.1=35.5

43. 0.8×〔15.5-(3.21+5.79)〕 = 0.8 x (15.5 - 9) = 0.8 x 6.5 = 5.2

44.（31.8+3.2×4）÷5 = (31.8 + 12.8)÷5 = 44.6÷5 = 8.92

45. 31.5×4÷(6+3) = 126 ÷ 9 = 14

46. 2÷2.5+2.5÷2 = 0.8 + 1.25 =2.05

47. 194－64.8÷1.8×0.9 = 194 -36 x0.9 = 194-32.4 = 161.65180－705×6 = 5180 - 4230=950

48. 24÷2.4－2.5×0.8 =10 -2=8

49. 405×(3213-3189) =405x24 = 9720

59. 125×(97-81) =125x16 =2000

60. 6942+480÷3 = 6942 + 160 = 6782

61. 20+80÷4-20 = 20 + 20 -20 = 40 -20 = 20

62. 100÷（32-30）×0 = 100 ÷2 x0= 50 x0 = 0

63. 25×4-12×5 = 100 - 60 = 40

64. 70×〔（42-42）÷18〕=70 x (0÷18) = 70x0 = 0

65. 75×65+75×35 = 75 x (65 +35) = 75x100 = 7500?

66. 6-1.6÷4= 6- 0.4 = 5.6

67. 5.38+7.85-5.37= 13.23 - 5.37=7.86

68. 7.2÷0.8-1.2×5=9 - 6 =3

69. 6-1.19×3-0.43= 6-3.57 - 0.43 = 6- (3.57 + 0.43) = 6-4 = 2

70. 6.5×（4.8-1.2×4）= 6.5 x(4.8 - 4.8 )=6.5 x0 = 0

71. 0.68×1.9+0.32×1.9 = (0.68 + 0.32) x1.9 = 1 x 1.9 = 1.9

72. 10.15-10.75×0.4-5.7 = 10.15 - 4.3 - 5.7 = 10.15 -(4.3 + 5.7)=10.15 - 10 =0.15

73. 5.8×（3.87-0.13）+4.2×3.74 = 5.8 x 3.74 +4.2 x 3.74 = (5.8 +4.2)x3.74 = 10 x 3.74 = 37.4

74. 32.52-（6+9.728÷3.2）×2.5 = 32.52 - (6+3.04)x2.5 = 32.52 - 9.02 x 2.5 = 32.52 -22.55 = 9.97

75.（136+64）×（65-345÷23）= 200x(65-15) = 200x 50=10000

76. 0.4×125×25×0.8 =(0.4×25)×(125×0.8)=10×100=1000?

77. 1.25×(8+10) =1.25×8+1.25×10=10+12.5=22.5?

78. 9123-(123+8.8) =9123-123-8.8=9000-8.8=8991.2?

79. 1.24×8.3+8.3×1.76 =8.3×(1.24+1.76)=8.3×3=24.9?

80. 9999×1001 =9999×(1000+1)=9999×1000+9999×1 =10008999?

81. 14.8×6.3-6.3×6.5+8.3×3.7 =(14.8-6.5)×6.3+8.3×3.7=8.3×6.3+8.3×3.7?

82. 8.3×(6.3+3.7) =8.3×10 =83?

83. 1.24+0.78+8.76 =(1.24+8.76)+0.78 =10+0.78 =10.78?

84. 933-157-43 =933-(157+43)=933-200=733

85. 4821-998 =4821-1000+2=3823?

86. I32×125×25 =4×8×125×25 ?=(4×25)×(8×125)=100×1000 =100000

87. 9048÷268

=(2600+2600+2600+1248)÷26

=2600÷26+2600÷26+2600÷26+1248÷269

=100+100+100+48

=348

88. 2881÷ 43 =(1290+1591)÷ 434=1290÷43+1591÷43=30+37

89. 1.8+18÷1.5-0.5×0.3 =1.8+12-0.15=13.8-0.15=13.65

90. 6.5×8+3.5×8-47 =52+28-47=80-47

91. (80-9.8)×5分之2-1.32 =70.2X2/5-1.32=28.08-1.32=26.76

92. 8×7分之4÷[1÷(3.2-2.95)]=8×4/7÷[1÷0.25]=8×4/7÷4=8/7

93. 2700×(506-499)÷900 =2700×7÷900 =18900÷900 =21?

94. 33.02-(148.4-90.85)÷2.5=33.02-57.55÷2.5=33.02-23.02 =10

95. (1÷1-1)÷5.1 =(1-1)÷5.1 =0÷5.1 =0

96. 18.1+(3-0.299÷0.23)×1=18.1+1.7×1 =18.1+1.7 =19.8

97. 4.1/27+505/2727+131313/272727 =1/27+5*101/(27*101)+13*10101/(27*10101)

=1/27+5/27+13/27=19/27

98. 6.5×8+3.5×8-47 =52+28-47=80-47

99. (80-9.8)×5分之2-1.32 =70.2X2/5-1.32=28.08-1.32=26.76

100. 1.8+18÷1.5-0.5×0.3 =1.8+12-0.15=13.8-0.15=13.65

延展回答

脱式计算即递等式计算，把计算过程完整写出来的运算，也就是脱离横式的计算。

在计算混合运算时，通常是一步计算一个算式(逐步计算，等号不能写在原式上)，要写出每一步的过程。一般来说，等号要往前，不与第一行对齐。也就是离开原式计算。

(脱字念tuo)主要掌握的是记住要先算乘、除法，后算加、减法。在乘除法连续计算时中，要按从左往右的顺序依次计算。遇到括号，要首先计算括号内部。

在脱式过程中要按运算顺序划出运算顺序线，还要做到"三核对"，一要核对从书上把题抄到作业本上数字、符号是否抄对。二要核对从横式抄到草稿竖式的数字、符号是否抄对。三要核对把草稿竖式上的得数，抄到横式上是否抄对，小数点是否点对地方，有无遗漏。

100道五年级脱式计算题带答案和过程都有哪些？

31.72÷6.1X2.3，本题系是小数乘除混合运算的一道计算题。解答本计算题应按照四则混合运算顺序进行计算，本计算题是乘、除同级运算，只能从左到右依次计算，计算方法可参考如下：

31.72÷6.1X2.3

＝5.2X2.3

＝11.9

5.4÷1.8+240×1.5=3+360=363

9000÷72×(1.25×0.7×8)=9000÷72×7=125×7=875

1.25×(8+10)=1.25×8+1.25×10=10+12.5=22.5

1.24+0.78+8.76=(1.24+8.76)+0.78=10+0.78=10.78

1/2-(4/5-1/2)=1/2+1/2-4/5=1-4/5=1/5

4800÷25÷4=4800÷(25x4)=4800÷100=4800÷100=48

2/5-(3/8-3/5)=2/5+3/5-3/8=1-3/8=5/8

3/4-(3/7-1/4)=3/4+1/4-3/7=1-3/7=4/7

3.2x0.125x2.5=0.125x8x(0.4x2.5)=1x1=1

0.4×125×25×0.8=(0.4×25)×(125×0.8)=10×100=1000

1.25×(8+10)=1.25×8+1.25×10=10+12.5=22.5

9123-(123+8.8)=9123-123-8.8=9000-8.8=8991.2

1.24×8.3+8.3×1.76=8.3×(1.24+1.76)=8.3×3=24.9

9999×1001=9999×(1000+1)=9999×1000+9999×1=10008999

14.8×6.3-6.3×6.5+8.3×3.7=(14.8-6.5)×6.3+8.3×3.7=8.3×6.3+8.3×3.7=8.3×(6.3+3.7)

=8.3×10=83

1.24+0.78+8.76=(1.24+8.76)+0.78=10+0.78=10.78

933-157-43=933-(157+43)=933-200=733

4821-998=4821-1000+2=3823

32×125×25=4×8×125×25=(4×25)×(8×125)=100×1000=100000

1.8+18÷1.5-0.5×0.3=1.8+12-0.15=13.8-0.15=13.65

6.5×8+3.5×8-47=52+28-47=80-47=33

3.7x2.56-2.3=9.472-2.3=7.172

1.24+0.78+8.76=(1.24+8.76)+0.78=10+0.78=10.78

1/2-(4/5-1/2)=1/2+1/2-4/5=1-4/5=1/5

4800÷25÷4=4800÷(25x4)=4800÷100=4800÷100=48

2/5-(3/8-3/5)=2/5+3/5-3/8=1-3/8=5/8

3/4-(3/7-1/4)=3/4+1/4-3/7=1-3/7=4/7

3.2x0.125x2.5=0.125x8x(0.4x2.5)=1x1=1

0.4×125×25×0.8=(0.4×25)×(125×0.8)=10×100=1000

1.25×(8+10)=1.25×8+1.25×10=10+12.5=22.5

9123-(123+8.8)=9123-123-8.8=9000-8.8=8991.2

1.24×8.3+8.3×1.76=8.3×(1.24+1.76)=8.3×3=24.9

61-(1.25+2.5×0.7)=61-3=58

[(10-0.8)+9.85]-2÷0.125=19.05-2÷0.125=19.05-16=3.05

408－12×24?=?408?-?288?=?120（46＋28）×60?=?74?x?60?=?4440

42×50－17?=?2100-?17?=?2083

32＋105÷5?=?32?+?21?=?53

420×（327－238）?=?420?x?89?=?37380

(4121+2389)÷7?=?6510?÷7?=?930

3.416÷（0.016×35）?=?3.416?÷0.56?=?6.1

0.8×[(10－6.76)÷1.2]?=?0.8?x(3.24÷1.2)?=?0.8?x?2.7?=?2.16

5.67×0.2-0.62?=?1.134-0.62?=?0.514

0.4×0.7×0.25?=?0.4?x?0.25?x?0.7?=?0.1?x?0.7?=?0.07

0.78+5.436+1?=?6.216?+1?=?7.216

30.8÷[14－(9.85＋1.07)]?=?30.8?÷?(14?-?10.92)?=?30.8÷3.08?=?10

[60－(9.5＋28.9)]÷0.18?=?(60-?38.4)÷0.18?=?21.6?÷0.18?=?120

2.881÷0.43－0.24×3.5?=?6.7?-?0.24?x3.5?=?6.7?-?0.84?=?5.86

5.38+7.85-5.37=?13.23?-?5.37=7.86

7.2÷0.8-1.2×5=9?-?6?=3

6-1.19×3-0.43=?6-3.57?-?0.43?=?6-?(3.57?+?0.43)?=?6-4?=?2

6.5×（4.8-1.2×4）=?6.5?x(4.8?-?4.8?)=6.5?x0?=?0

0.68×1.9+0.32×1.9?=?(0.68?+?0.32)?x1.9?=?1?x?1.9?=?1.9

10.15-10.75×0.4-5.7?=?10.15?-?4.3?-?5.7?=?10.15?-(4.3?+?5.7)=10.15?-?10?=0.15

5.8×（3.87-0.13）+4.2×3.74?=?5.8?x?3.74?+4.2?x?3.74?=?(5.8?+4.2)x3.74?=?10?x?3.74?=?37.4

20×[(2.44－1.8)÷0.4＋0.15]?=?20x?(0.64?÷0.4?+0.15)=?20x(1.6?+0.15)?=?20?x1.75?=?35

28-(3.4+1.25×2.4)?=?28?-?(3.4?+?3)?=?28?-?6.4?=?21.6

2.55×7.1+2.45×7.1?=?(2.55?+?2.45)?x7.1?=?5?x7.1=35.5

0.8×〔15.5-(3.21+5.79)〕?=?0.8?x?(15.5?-?9)?=?0.8?x?6.5?=?5.2

（31.8+3.2×4）÷5?=?(31.8?+?12.8)÷5?=?44.6÷5?=?8.92

31.5×4÷(6+3)?=?126?÷?9?=?14

2÷2.5+2.5÷2?=?0.8?+?1.25?=2.05

194－64.8÷1.8×0.9?=?194?-36?x0.9?=?194-32.4?=?161.65180－705×6?=?5180?-?4230=950

24÷2.4－2.5×0.8?=10?-2=8

405×(3213-3189)?=405x24?=?9720

125×(97-81)?=125x16?=2000

6942+480÷3?=?6942?+?160?=?6782

20+80÷4-20?=?20?+?20?-20?=?40?-20?=?20

100÷（32-30）×0?=?100?÷2?x0=?50?x0?=?0

25×4-12×5?=?100?-?60?=?40

70×〔（42-42）÷18〕=70?x?(0÷18)?=?70x0?=?0

75×65+75×35?=?75?x?(65?+35)?=?75x100?=?7500?

6-1.6÷4=?6-?0.4?=?5.6

32.52-（6+9.728÷3.2）×2.5?=?32.52?-?(6+3.04)x2.5?=?32.52?-?9.02?x?2.5?=?32.52?-22.55?=?9.97

（136+64）×（65-345÷23）=?200x(65-15)?=?200x?50=10000