(7X-5)(5X+5)=7 X*5X+100怎么解?
问题描述:
(7X-5)(5X+5)=7 X*5X+100怎么解?
答
(7X-5)(5X+5)=7 X*5X+100
35X*X+10X-25=35X*X+100
10X=100+25
10X=125
X=125/10
X=12.5