知识大全 计算下面各题(能简算的要简算)25×18×4 25×(40+7) 18×56+44×18 201×41 38×99+38 101×

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计算下面各题(能简算的要简算)25×18×4 25×(40+7) 18×56+44×18 201×41 38×99+38 101×

(1)25×18×4,
=25×4×18,
=100×18,
=1800;(2)25×(40+7),
=25×40+25×7,
=1000+175,
=1175;

(3)18×56+44×18,
=18×(56+44),
=18×100,
=1800;

(4)201×41,
=(200+1)×41,
=200×41+1×41,
=8200+41,
=8241;

(5)38×99+38,
=38×(99+1),
=38×100,
=3800;

(6)101×74-74,
=(101-1)×74,
=100×74,
=7400;

(7)425+21×(12+28),
=425+21×40,
=425+840,
=1265;

(8)15×[120-(42+36)],
=15×[120-78],
=15×42,
=630;

(9)(450÷18-13)×80,
=(25-13)×80,
=12×80,
=960;

(10)600÷[2×(210-180)],
=600÷[2×30],
=600÷60,
=10.

计算下面各题,能简算的要简算: 56×(2÷58?3) [334?(172?4×158)]÷34 [9?(112+18)×24]÷85

(1)

5
6

×(2÷

5
8

-3),
=

5
6

×(2×

8
5

-3),
=

5
6

×2×

8
5

-

5
6

×3,
=

8
3

?

5
2


=

16
6

?

15
6


=

1
6

(2)[

33
4

?(

17
2

?4×

15
8

)]÷

3
4


=[

33
4

-(

17
2

-

15
2

3
4


=

29
4

×

4
3


=9

2
3

(3)[9-(

1
12

+

1
8

)×24]÷

8
5


=[9-(24×

1
12

+24×

1
8

)]×

5
8


=[9-5]×

5
8


=2.5.

计算下面各题,能简算的要简算.(125+7)×8 3200÷25×4 3.27+6.4+2.73+4.6 25×44 6.45-0.58-1.

(1)(125+7)×8,
=125×8+7×8,
=1000+56,
=1056;

(2)3200÷25×4,
=128×4,
=512;

(3)3.27+6.4+2.73+4.6,
=(3.27+2.73)+(6.4+4.6),
=6+11,
=17;

(4)25×44,
=25×4×11,
=100×11,
=1100;

(5)6.45-0.58-1.42,
=6.45-(0.58+1.42),
=6.45-2,
=4.45;

(6)12×(324-285)÷26,
=12×39÷26,
=468÷26,
=18.

计算下面各题(能简算的要简算).807×99+807 [1-(12-14)]×25 20.11×83+1.7×201.1 65×38+58

(1)807×99+807,
=807×(99+1),
=807×100,
=80700;

(2)[1-(

1
2

-

1
4

)]×

2
5


=[1-

1
4

2
5


=

3
4

×

2
5


=

3
10

(3)20.11×83+1.7×201.1,
=20.11×83+17×20.11,
=20.11×(83+17),
=20.11×100,
=2011;

(4)

6
5

×

3
8

+

5
8

÷

5
6


=

6
5

×(

3
8

+

5
8

),
=

6
5

×1,
=

6
5

(能简便的要简算) 102×45 823-497 18×56+44×18 25×18×4 77×99+77

(1)102×45,
=(100+2)×45,
=100×45+2×45,
=4500+90,
=4590;(2)823-497,
=823-(500-3),
=823-500+3,
=323+3,
=326;

(3)18×56+44×18,
=18×(56+44),
=18×100,
=1800;

(4)25×18×4,
=25×4×18,
=100×18,
=1800;

(5)77×99+77,
=77×(99+1),
=77×100,
=7700.

计算下面各题,能简算的要简算. ①2-27-57 ②58-(58-12) ③43-18+712 ④6-(34-25

①2-

2
7

-

5
7


=2-(

2
7

+

5
7

),
=2-1,
=1;

5
8

-(

5
8

-

1
2

),
=

5
8

-

5
8

+

1
2


=

1
2

4
3

-

1
8

+

7
12


=

29
24

+

7
12


=

43
24

④6-(

3
4

-

2
5

),
=6-

7
20


=5

13
20

计算下面各题,能简算的要简算. (125+7)×8 3.27+6.4+2.73+4.6 25×44 12×(324-285

(1)(125+7)×8,
=125×8+7×8,
=1000+56,
=1056;(2)3.27+6.4+2.73+4.6,
=(3.27+2.73)+(6.4+4.6),
=6+11,
=17;

(3)25×44,
=25×(4×11),
=25×4×11,
=100×11,
=1100;

(4)12×(324-285)÷26,
=12×39÷26,
=468÷26,
=18.

计算下面各题,能简算的就简算.47×4.5-27×4.51.25×3.2×0.80.75×18÷0

①47×4.5-27×4.5
=(47-27)×4.5
=20×4.5
=90;

②1.25×3.2×0.8
=3.2×(1.25×0.8)
=3.2×1
=3.2;

③0.75×18÷0.25
=0.75÷0.25×18
=3×18
=54;

④9.07-22.78÷3.4
=9.07-6.7
=2.37.

计算下面各题(能简算的要简算)1.25×3.2×2.5 1.8×5.6+44×0.18 3.4×99+3.4 101×8.3-8.3 (27

(1)1.25×3.2×2.5,
=(1.25×0.8)×(4×2.5),
=1×10,
=10;

(2)1.8×5.6+44×0.18,
=1.8×(5.6+4.4),
=1.8×10,
=18;

(3)3.4×99+3.4,
=3.4×(99+1),
=3.4×100,
=340;

(4)101×8.3-8.3,
=(101-1)×8.3,
=100×8.3,
=830;

(5)(27÷1.8-11)×2.5,
=(15-11)×2.5,
=4×2.5,
=10;

(6)39.4×[0.96÷(5.4÷0.9)],
=39.4×[0.96÷6],
=39.4×0.16,
=6.304.

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