(x+30)*(x-18)=x*x

问题描述:

(x+30)*(x-18)=x*x

(x+30)*(x-18)=x*x
x*x+30x-18x-30*18=x*x
x*x+12x-540=x*x
12x=540
x=45

下面是我给的结果,你看一下吧
(X+30)*(X-18)=X*X
X*X+12x-540=X*X
x=45