七点二五乘百分之四十加二点七五乘五分之二的和除百分之二十简便方法怎样算?
3个回答
2013-12-21
展开全部
(7.25*40%+2.75*2/5 )/20%
=7.25*40%/20%+2.75*2/5 /20%
=7.25*2+2.75*2
=(7.25+2.75)*2
=10*2
=20
=7.25*40%/20%+2.75*2/5 /20%
=7.25*2+2.75*2
=(7.25+2.75)*2
=10*2
=20
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