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计算 能简算的写出简算过程.(1)7.5÷25-2.5×52(2)3.5×45+5.5×80

2022-08-14 02:41:29 问答库 阅读 200 次

问题详情

计算,能简算的写出简算过程.
(1)7.5÷2

5

-2.5×5

2


(2)3.5×4

5

+5.5×80%+0.8
(3)24×[(11

6

-2

3

)÷3]
(4)3.25-2.8×5

7

+1

4

×4

7

÷0.1.

参考答案


(1)7.5÷25-2.5×52,
=7.5×52-2.5×52,
=(7.5-2.5)×52,
=5×52,
=252;

(2)3.5×45+5.5×80%+0.8,
=3.5×0.8+5.5×0.8+0.8,
=(3.5+5.5+1)×0.8,
=10×0.8,
=8;

(3)24×[(116-23)÷3],
=24×[12÷3],
=24×16,
=4;

(4)3.25-2.8×57+14×47÷0.1,
=3.25-2+17÷0.1,
=3.25-2+107,
=1.25+107,
=21928.

考点:过程