计算下列各题(能简算的要简算)3 8 1 9 7

2021-03-17 07:13:06 字数 2627 阅读 7649

1楼:沙碧兽

(1)3.8-1.9+7.2-8.1,

=(3.8+7.2)-(1.9+8.1),=11-10,

=1;(2)(7 8

+5 8

)÷3 7

÷15,

=3 2

÷3 7

÷15,

=7 2

÷15,

=7 30

;(3)40-(7.7+4.8÷1.2),

=40-(7.7+4),

=40-11.7,

=28.3;

(4)(3

29+1 13

)×13×29,

=3 29

×13×29+1

13×13×29,

=39+29,

=68.

计算下面各题,能简算的要简算1/2+4/7+3/7 1/10+3/8-2/5 1-(2/3+1/8) 7/8-(2/3-1/4) 1/9+(1/6+2/9)+5/6

2楼:新野旁观者

计算下面各题,能简算的要简算

1/2+4/7+3/7

=1/2+(4/7+3/7)

=1/2+1

=1又1/2

1/10+3/8-2/5

=19/40-2/5

=3/40

1-(2/3+1/8)

=1-2/3-1/8

=1/3-1/8

=5/24

7/8-(2/3-1/4)

=7/8+1/4-2/3

=9/8-2/3

=11/24

1/9+(1/6+2/9)+5/6

=(1/9+2/9)+(1/6+5/6)

=1/3+1

=1又1/3

,能简算的要简算1/2+4/7+3/7 1/10+3/8-2/5 1-(2/3+1/8) 7/8-(2/3-1/4) 1/9+(1/6+2/9)+5/6

3楼:新野旁观者

计算下面各题,能简算的要简算内

1/2+4/7+3/7

=1/2+(4/7+3/7)

=1/2+1

=1又容1/2

1/10+3/8-2/5

=19/40-2/5

=3/40

1-(2/3+1/8)

=1-2/3-1/8

=1/3-1/8

=5/24

7/8-(2/3-1/4)

=7/8+1/4-2/3

=9/8-2/3

=11/24

1/9+(1/6+2/9)+5/6

=(1/9+2/9)+(1/6+5/6)

=1/3+1

=1又1/3

计算下面各题(能简算的要简算)48-2.3×1250×(0.8+0.4)7.34×2.1+7.34×7.8+7.34×1.120.5÷1.25÷0.

4楼:淹了学校

①48-2.3×12,

=48-27.6,

=20.4;

②50×(0.8+0.4),

=50×0.8+50×0.4,

=40+20,

=60;

③7.34×2.1+7.34×7.8+7.34×1.1,=7.34×(2.1+7.8+1.1),

=7.34×10,

=73.4;

④20.5÷1.25÷0.8,

=20.5÷(1.25×0.8),

=20.5÷1,

=20.5;

⑤(8.1-5.4)÷3.6+85.7,

=2.7÷3.6+85.7,

=0.75+85.7,

=86.45;

⑥9.88×9+9.88,

=9.88×(9+1),

=9.88×10,

=98.8.

计算下面各题,能简算的要简算,并写出主要的计算过程.①7.8-8.75+2.2-1.25②13.2÷(9.4-5)+5.32③1-

5楼:可乐

①7.8-8.75+2.2-1.25,

=(7.8+2.2)-(8.75+1.25),=10-10,

=0;②13.2÷(62616964757a686964616fe78988e69d83313333353331389.4-5)+5.32,

=13.2÷4.4+5.32,

=3+5.32,

=8.32;

③1-3 7

-4 7

,=1-(3 7

+4 7

),=1-1,

=0;④13

17-(5

17+1

10),

=13 17

-517

-1 10

,=8 17

-110

,=63

170;

⑤1 5

+(5 6

-1318

),=1 5

+(15

18-13

18) ,

=1 5

+1 9

,=1445.

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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