计算(x-y)的2次方减(x+y)的2次方
问题描述:
计算(x-y)的2次方减(x+y)的2次方
答
答案是:-4xy
答
结过是负4XY
答
(x-y)^2-(x+y)^2
=x^2-2xy+y^2-x^2-2xy-y^2
=-4xy
答
(x-y)^2-(x+y)^2
=x^2-2xy+y^2-x^2-2xy-y^2
=-4xy