2/1x-2(x-3/1y的平方)+(-2/3x+3/1y的平方)其中x=-2,y=3/2先化简再求值,

问题描述:

2/1x-2(x-3/1y的平方)+(-2/3x+3/1y的平方)其中x=-2,y=3/2先化简再求值,

原式=2/1x-2x+3/2y²-2/3x+3/1y²
=(2/1-2+2/3)x+(3/2+3/1)y²
=0+y²
=y²