解方程：X(X-2)=80
x-2(x-2)x8=80\u600e\u4e48\u89e3\u65b9\u7a0bx-2(x-2)x8=80
x-16x+32=80
-15x=48
x=-3.2
x(x-2)=80
x^2-2x-80=0
(x-10)(x+8)=0
x1=10, x2=-8
x^2-2x=80
x^2-2x+1=81
(x-1)^2=81
x-1=±9
x1=10
x2=-8
方法2）因式分解法：
x^2-2x-80=0
(x-10)(x+8)=0
x1=10
x2=-8
X(X-2)=80
X^2-2X-80=0
(X-10)(X+8)=0
X=10或-8
x^2-2x=80
x=10
答题不易，望采纳，祝学习进步
x²+2x-80=0
x²+10x-8x-80=0
x(x+10)-8(x+10)=0
(x+10)(x-8)=0
∴x=-10 x=8
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