问题
解答题
怎样简便就怎样计算. 57.5-4.25-15.75 125×32
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答案
①57.5-4.25-15.75
=57.5-(4.25+15.75)
=57.5-20
=37.5;
②125×32
=125×8×4
=1000×4
=4000;
③
×16.31-2.31÷5 7 7 5
=
×16.31-2.31×5 7 5 7
=
×(16.31-2.31)5 7
=
×145 7
=10.