脫式計算簡便180道不簡便180道帶答案

2021-03-07 05:41:58 字數 10205 閱讀 3114

1樓:新野旁觀者

(1)2.5*32*0.125

=(2.5*4)*(8*0.125)

=10*1

=10(2)3.5-7+6.5

=3.5+6.5-7

=3(3)1.2×2.5+0.8×2.5

=2.5(1.2+0.8)

=25(4)8.9×1.25-0.9×1.25

=1.25(8.9-0.9)

=10(5)12.5×7.4×0.8

=12.5×0.8×7.4

=74(6)6.5×9.5+6.5×0.5

=6.5×(9.5+0.5)

=6.5×10

=65(7)0.35×1.6+0.35×3.4

=0.35*(1.6+3.4)

=0.35*5

=1.75

(8)6.72-3.28-1.72

=6.75-(3.28+1.72)

=6.75-5

=1.75

(9)0.45+6.37+4.55

=0.45+4.55+6.37

=5+6.37

=11.37

(10)28×12.5-12.5×20

=(28-20)*12.5

=8*12.5

=100

(11)23.65-(3.07+3.65)

=23.65-3.65-3.07

=20-3.07

=16.93

(12)(4+0.4×0.25)8×7×1.25

=(4+1)*7*10

=5*7*10

=350

(13)1.65×99+1.65

=1.65*(99+1)

=1.65*100

=165

(14)27.85-(7.85+3.4)

=27.85-7.85+3.4

=20+3.4

=23.4

(15)48×1.25+50×1.25×0.2×8

7.8×9.9+0.78

=7.8*(9.9+0.1)

=7.8*10

=78(16)4.8×46+4.8×54

=(46+54)*4.8

=100*4.8

=480

(17)673-327-173

=673-(327+173)

=673-500

=173

(18)4.44*2.5

=1.11*(4*2.5)

=1.11*10

=11.1

(19)3.5÷1.4

=(3.5÷0.7)÷(1.4÷0.7)

=5÷2

=2.5

(20)1+2+3+4+5......+99+100

=(1+99)+(2+98)+(3+97)+......+(49+51)+50

=(100÷2-1)*100+50

=4900+50

=4950⑴運用加法交換律進行簡便計算。

0.88+5.6+0.12 1.78+3.5+0.22 5.6+2.08+14.4

=0.88+0.12+5.6 =1.78+0.22+3.5 =5.6+14.4+2.08

=1+5.6 =2+3.5 =20+2.08

=6.6 =5.5 =22.08

⑵運用加法結合律進行簡便計算

2.3+(0.56+4.7) 28.6+0.54+0.46+1.4 5.82+4.56+5.44

=(2.3+4.7)+0.56 =(28.6+1.4)+(0.54+0.46) =5.82+(4.56+5.44)

=7+0.56 =30+1 =5.82+10

=7.56 =31 =15.82

⑶、運用乘法交換律進行簡便計算。

25×0.37×0.4 7.5×0.39×4 6.5×1.1×4 1.25×3.9×0.8

=25×0.4×0.37 =7.5×4×0.39 =6.5×4×1.1 =1.25×0.8×3.9

=10×0.37 =30×0.39 =26×1.1 =1×3.9

=3.7 =11.7 =28.6 =3.9

⑷、運用乘法結合律進行簡便計算。

1.9×7.5×8 6.2×0.8×2.5 4.3×1.5×6 4.1×3.5×2

=1.9×(7.5×8) =6.2×(0.8×2.5) =4.3×(1.5×6) =4.1×(3.5×2)

=1.9×60 =6.2×2 =4.3×9 =4.1×7

=114 =12.4 =38.7 =28.7

⑸、運用乘法分配律的加法進行簡算。

13.6×4.6+4.6×6.4 0.72×23+77×0.72 2.6×32+32×2.4

=(13.6+6.4)×4.6 =(23+77)×0.72 =(2.6+2.4) ×32

=20×6.4 =100×0.72 =5×32

=128 =72 =160

⑹、運用乘法分配律的減法進行簡算。

12×5.9-5.9×2 4.6×2.5-2.5×0.6 101×9.7-9.7

=(12-2) ×5.9 =(4.6-0.6)×2.5 =(101-1)×9.7

=(12-2) ×5.9 =(4.6-0.6)×2.5 =(101-1)×9.7

=10×5.9 =4×2.5 =100×9.7

=59 =10 =970

⑺、運用減法的運算規律進行簡便計算。

1.8-0.45-0.55 54.4-4.6-5.4 35.6-0.13-0.47

=1.8-(0.45+0.55) =54.4-(4.6+5.4) =35.6-(0.13+0.47)

=1.8-1 =54.4-10 =35.6-0.6

=0.8 =44.4 =35

⑻、運用除法的運算規律進行簡便計算。

4.5÷4÷7.5 14.8÷1.25÷8 18.5÷4÷1.25 5.4÷4÷0.45

=4.5÷(4×7.5) =14.8÷(1.25×8) =18.5÷(4×1.25) =5.4÷(4×0.45)

=4.5÷30 =14.8÷10 =18.5÷5 =5.4÷0.18

=0.15 =1.48 =3.7 =30

⑼綜合運用各種運算定律進行簡算。

2.54+2.46+0.44+0.54 10.7×0.4-6.7×0.4 0.5×3.2×1.25

=(2.54+2.46)+(0.44+0.54) =(10.7-6.7)×0.4 =(0.5×4)×(0.8×1.25)

=5+1 =4×0.4 =2×1

=6 =1.6 =2

89.7+5.8-9.7+4.2 99×0.38+0.38 360÷(18×0.4)

=(89.7-9.7)+(5.8+4.2) =(99+1) ×0.38 =360÷18÷0.4

=80+10 =100×0.38 =20÷0. 4

=90 =38 =50

4.8×12.5 2.5×1.6×12.5 3.2×102

=0.6×(8×12.5) =(2.5×0.2)×(8×12.5) =3.2×(100+2)

=0.6×100 =0.5×100 =3.2×100+3.2×2

=60 =50 =320+6.4

=326.4

2樓:匿名使用者

小學範圍內脫式計算規則,

1,從左至右計算。

2,先計算乘除法,再計算加減法。

3,先計算括號內,再計算括號外。

————

適當的情況下,可以應用簡便計算規律調整計算順序。

3樓:匿名使用者

........................

有100道脫式簡便計算題帶答案和過程嗎

4樓:瑞安丫

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

=837. 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.

474. 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

脫式計算即遞等式計算,把計算過程完整寫出來的運算,也就是脫離橫式的計算。

在計算混合運算時,通常是一步計算乙個算式(逐步計算,等號不能寫在原式上),要寫出每一步的過程。一般來說,等號要往前,不與第一行對齊。也就是離開原式計算。

(脫字念tuo)主要掌握的是記住要先算乘、除法,後算加、減法。在乘除法連續計算時中,要按從左往右的順序依次計算。遇到括號,要首先計算括號內部。

在脫式過程中要按運算順序劃出運算順序線,還要做到"三核對",一要核對從書上把題抄到作業本上數字、符號是否抄對。二要核對從橫式抄到草稿豎式的數字、符號是否抄對。三要核對把草稿豎式上的得數,抄到橫式上是否抄對,小數點是否點對地方,有無遺漏。

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