问题 解答题

怎样算简便就怎样算

①9.5-9.5×(9.5-9.5)÷9.5

②12.5×4×0.25×80

③45.893-(3.7+25.893)

④20-[8.07+(7.54-3.86)].

答案

①9.5-9.5×(9.5-9.5)÷9.5,

=9.5-9.5×0÷9.5,

=9.5-0,

=9.5;

②12.5×4×0.25×80,

=(12.5×80)×(4×0.25),

=1000×1,

=1000;

③45.893-(3.7+25.893),

=45.893-3.7-25.893,

=(45.893-25.893)-3.7,

=20-3.7,

=16.3;

④20-[8.07+(7.54-3.86)],

=20-[8.07+3.68],

=20-11.75,

=8.25.

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