Question

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？

Answer 1

(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

Answer 2

(7.25×40%+2.75×2/5)÷20%
=(7.25+2.75)×40%÷20%
=10×2
=20

Answer 3

应用乘法分配律
（7.25×40%+2.75×2/5）÷20%
=（7.25×40%+2.75×40%）÷20%
=（7.25+2.75）×40%÷20%
=10×40%÷20%
=4÷20%
=20