问题 解答题
简便计算
12.25+36+7.7585×199+85721-303
答案

(1)12.25+36+7.75,

=(12.25+7.75)+36,

=20+36,

=56;

(2)85×199+85,

=85×(199+1),

=85×200,

=17000;

(3)721-303,

=(700+21)-(300+3),

=(700-300)+(21-3),

=400+18,

=418.

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