脫式計算,能簡算的要簡算22 3 2 45 5 3 4 55 920 12 25 1343 3(

2021-04-30 04:33:06 字數 2051 閱讀 5193

1樓:手機使用者

(1)22.3-2.45-5.3-4.55,=(22.3-5.3)-(2.45+4.55),=17-7,

=10;

(2)9

20÷[1

2×(25+1

3)],

=920

÷[12

×1115

],=9

20÷1130,

=2722

;(3)[43.3×(2-75%)+7]×12,=[43.3×1.25+7]×12,

=[54.125+7]×12,

=61.125×12,

=30.5625;

(4)9

20×103?9

20×3,

=920

×(103?3),

=920

×100,

=45;

(5)5

9÷5+4

9÷4,=19

+19,=2

9;(6)12?6

13÷9

26?23,

=12-43-2

3,=12-(43+2

3),=12-2,

=10.

脫式計算:(能簡算的要寫簡算過程)13.7×0.25×8;[12.7-(7.25+4.5)]×5.2;7

2樓:

(1)13.7×0.25×8

=13.7×(0.25×8)

=13.7×2

=27.4;

(2)[12.7-(7.25+4.5)]×5.2=[12.7-11.75]×5.2

=0.95×5.2

=4.94;

(3)799×99

=799×(100-1)

=799×100-799

=79900-(800-1)

=79900-800+1

=79101.

(4)1.6×(2.25+27.75÷1.5)=1.6×(2.25+18.5)

=1.6×20.75

=33.2.

計算下面各題,能簡便的要用簡便方法計算21÷(13+25)÷911920÷[12×(45+25)]5.65-6.29+5.35-2.713.7×99

3樓:桓廣英

(1)21÷(13+2

5)÷9

11=21÷11

15÷9

11=21÷(11

15×911)

=21÷3

5=35;

(2)9

20÷[1

2×(45+2

5)]=920

÷[12×65

]=920÷35=3

4;(3)5.65-6.29+5.35-2.71=(5.65+5.35)-(6.29+2.71)=11-9

=2;(4)3.7×99+3.7

=3.7×(99+1)

=3.7×100

=370.

遞等式計算.3×12-33.46÷0.35 12.74-0.125+2.26-9.875 0.25×3.2×1.25 5×13×0.4 89÷[(25

4樓:夏妹紙

3×12-33.46÷0.35

=36-95.6

=-59.6

12.74-0.125+2.26-9.875=(12.74+2.26)-(0.125+9.875)=15-10

=50.25×3.2×1.25

=0.25×(4×0.8)×1.25

=(0.25×4)×(0.8×1.25)

=1×1

=15×13×0.4

=5×0.4×13

=2×13

=2689÷[(25+110 )×34]

=89÷(135×34)

=89÷4590

≈0.02

45+45×19

=45×(1+19)

=45×20

=900

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