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能用简便方法的要用简便方法.①58-16÷45②29-615×29③62.5÷2.5÷4④8

2022-08-14 02:50:48 问答库 阅读 200 次

问题详情

能用简便方法的要用简便方法.
①58-16÷4

5


②2

9

-6

15

×2

9


③62.5÷2.5÷4

④8160÷24-36×2.5⑤36×(5

6

+1

12

-1

3

)⑥3.5÷[1-(0.4+1

4

)].

参考答案

①58-16÷45,
=58-20,
=38;

②29-615×29,
=(1-615)×29,
=915×29,
=215;

③62.5÷2.5÷4,
=62.5÷(2.5×4),
=62.5÷10,
=6.25;

④8160÷24-36×2.5,
=340-90,
=250;

⑤36×(56+112-13),
=36×56+36×112-36×13,
=30+3-12,
=21;

⑥3.5÷[1-(0.4+14)],
=3.5÷[1-0.65],
=3.5÷0.35,
=10.

考点:方法