67*1/4+5/2*3.75-9/2*25% 简便运算过程

问题描述:

67*1/4+5/2*3.75-9/2*25% 简便运算
过程

简单的通分,134/8+5*14/8-9/8=(134+70-9)/8=195/8


67*1/4+5/2*3.75-9/2*25%
=67*1/4+5/2*375/100-9/2*1/4
=67*2/8+5/2*15/4-9/8
=134/8+75/8-9/8
=(134+75-9)/8
=200/8
=25

原式=67×25%+250%×3.75-4.5×25%
=67×25%+25%×37.5-4.5×25%
=25%×(67+37.5-4.5)
=25%×100
=25