脱式计算(能简算的要简算2.5 7.

2021-01-10 21:10:15 字数 3812 阅读 7084

1楼:诶呀

(1)2.5×7.1×4,

=(2.5×4)×7.1,

=10×7.1,

=71;

(2)16.12×99+16.12,

=16.12×(99+1),

=16.12×100,

=1612;

(3)5.2×0.9+0.9×4.8,

=0.9×(5.2+4.8),

=0.9×10,

=9;(4)[113-(34.15+38.25)]÷2,=[113-72.4]÷2,

=40.6÷2,

=20.3;

(5)3.6÷(1.2+0.6)×0.5,=3.6÷1.8×0.5,

=2×0.5,

=1;(6)4.82÷0.25+1.25÷0.25,=4.82×4+1.25×4,

=19.28+5,

=24.28.

(7.51÷2-2.8)×1.1简算怎么简?

2楼:q他

5.6×

2.93.77×1.8

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

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

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

脱式计算:能简算的要简算。,脱式计算:一、能简算的要简算。③4/7×5/9+3/7×5/9 = = = =

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