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用递等式计算 能简算的要简算(1)(512+19+38)×72(2)(2-34×45)÷(1

2022-08-14 02:25:16 问答库 阅读 200 次

问题详情

用递等式计算,能简算的要简算
(1)(5

12

+1

9

+3

8

)×72
(2)(2-3

4

×4

5

)÷(1

12

+4

15

)

(3)52

5

-(15

6

+33

10

)
(4)[(21

3

+4.8÷13

5

)-41

6

]×11

2

参考答案

解(1)(512+19+38)×72,
=72×512+72×19+38×72,
=30+8+27,
=65;

(2)(2-34×45)÷(112+415),
=(2-35)÷(560+1660),
=75×6021
=4;

(3)525-(156+3310),
=51230-(12530+3930),
=44230-43430
=415

(4)[(213+4.8÷135)-416112
=[(213+3)-41632
=[526-41632
=76×32
=134

考点:等式