化简求值(x+y)(x-y)+(x-y)2-(6x2y-2xy2)÷(2y),其中x=-2,y=13;-数学

题目简介

化简求值(x+y)(x-y)+(x-y)2-(6x2y-2xy2)÷(2y),其中x=-2,y=13;-数学

题目详情

化简求值(x+y)(x-y)+(x-y)2-(6x2y-2xy2)÷(2y),其中x=-2,y=
1
3
题型:解答题难度:中档来源:不详

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=class="stub"1
3
时,
原式=-(-2)2-(-2)×class="stub"1
3
=-4+class="stub"2
3
=-class="stub"10
3

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