(X-1)(x+2)=70
问题描述:
(X-1)(x+2)=70
答
x²+x-2=70
x²+x-72=0
(x-8)(x+9)=0
x=8或x=-9
(X-1)(x+2)=70
x²+x-2=70
x²+x-72=0
(x-8)(x+9)=0
x=8或x=-9