问题
解答题
化简求值(x+y)(x-y)+(x-y)2-(6x2y-2xy2)÷(2y),其中x=-2,y=
|
答案
(x+y)(x-y)+(x-y)2-(6x2y-2xy2)÷(2y),
=x2-y2+x2-2xy+y2-3x2+xy,
=-x2-xy,
当x=-2,y=
时,1 3
原式=-(-2)2-(-2)×
=-4+1 3
=-2 3
.10 3
化简求值(x+y)(x-y)+(x-y)2-(6x2y-2xy2)÷(2y),其中x=-2,y=
|
(x+y)(x-y)+(x-y)2-(6x2y-2xy2)÷(2y),
=x2-y2+x2-2xy+y2-3x2+xy,
=-x2-xy,
当x=-2,y=
时,1 3
原式=-(-2)2-(-2)×
=-4+1 3
=-2 3
.10 3