问题
解答题
简便计算
|
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.
简便计算
|
(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.