x²-xy-2y²=0 用因式分解怎么分?
问题描述:
x²-xy-2y²=0 用因式分解怎么分?
答
x2-xy-2y2=0
x -2y
X
x y
(x-2y)(x+y)=0
x-2y=0,x+y=0
x=2y或x=-y