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递等式计算(能简便就要简便)①78+512-16②11126-1113-213+226③32

2022-08-14 02:43:29 问答库 阅读 200 次

问题详情

递等式计算(能简便就要简便)
①7

8

+5

12

-1

6

②111

26

-11

13

-2

13

+2

26

③32

27

-(5

27

+7

16

)

④10-2

9

-3

9

⑤5

9

-(5

6

-7

12

)⑥3

5

+12

7

+0.4-2

7

参考答案

①78+512-16,
=24×(78+512-16)÷24,
=(24×78+24×512-24×16)÷24,
=(21+10-4)÷24,
=27÷24,
=98,
=118;

②11126-1113-213+226,
=(11126+226)-(1113+213),
=1.5-1,
=0.5;

③3227-(527+716),
=3227-527-716,
=1-716,
=916;

④10-29-39,
=10-(29+39),
=10-59,
=949;

⑤59-(56-712),
=36×[59-(56-712)]÷36,
=[36×59-36×(56-712)]÷36,
=[20-(30-21)]÷36,
=[20-9]÷36,
=11÷36,
=1136;

⑥35+127+0.4-27,
=(35+0.4)+(127-27),
=1+1,
=2.

考点:等式