先化简,在求值：[x(X-y)-y(x-y)+(x+y)(x-y)]除2x,其中x=2012,y=2013_数学解答

先化简,在求值：[x(X-y)-y(x-y)+(x+y)(x-y)]除2x,其中x=2012,y=2013

人气：318 ℃　时间：2020-05-29 16:44:38

解答

[x(X-y)-y(x-y)+(x+y)(x-y)]除2x
=(X²-xy-xy+y²+x²-y²)除2x
=(2x²-2xy)÷2x
=x-y
=2012-2013
=-1