简便方法怎么解 16.5-0.25*5-7.25

我想简便方法是指这个吧

16.5-0.25*5-7.25
=16.5-(0.25*5-0.25)-7
=16.5-(0.25*6)-7
=16.5-1.5-7
=15-7
=8

16.5-0.25*5-7.25
=16.5-0.25*5-0.25*29
=16.5-0.25*(5+29)
=16.5-0.25*34
=16.5-0.25*2*17
=16.5-0.5*17
=0.5*33-0.5*17
=0.5*(33-17)
=0.5*16
=8.

16.5-0.25×5-7.25
=16.5-1.25-7.25
=16.5-(1.25+7.25）
=16.5-8.5
=8

这很简单啊，还要什么简便算法？

=16.5-0.25*5-0.25*3
=16.5+(-5-3)*0.25
=16.5-15
=1.5