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脱式计算.(能简算的要简算)19÷(13-19)89×[34-(716-14)]58÷[21

2022-08-14 02:49:07 问答库 阅读 200 次

问题详情

脱式计算.(能简算的要简算)
1

9

÷(1

3

-1

9

)

8

9

×[3

4

-(7

16

-1

4

)]

5

8

÷[2

11

×(1

5

+1

6

)]

7

9

÷11

5

+2

9

×5

11

5.58-3

5

+5.42-2

5

9998

9

+998

9

+98

9

+1

3

参考答案

(1)19÷(13-19)
=19÷29,
=12;

(2)89×[34-(716-14)]
=89×[34+14-716],
=89×[1-716],
=89×916,
=12;

(3)58÷[211×(15+16)]
=58÷[211×1130],
=58×15,
=938;

(4)79÷115+29×511
=79×511+29×511,
=(79+29)×511,
=1×511,
=511;

(5)5.58-35+5.42-25
=(5.58+5.42)-(35+25),
=11-1,
=10;

(6)99989+9989+989+13.
=1000+100+10+13-19-19-19,
=1110+(13-19×3),
=1110+(13-13).
=1110+0,
=1110.

考点: