1.化简求值:(x+y)(x-y)-(x-y)²-6x²y÷2y+(2xy)²÷(-4xy).其中x=-2.y=三分之一
问题描述:
1.化简求值:(x+y)(x-y)-(x-y)²-6x²y÷2y+(2xy)²÷(-4xy).其中x=-2.y=三分之一
答
化简求值:
(x+y)(x-y)-(x-y)²-6x²y÷2y+(2xy)²÷(-4xy)
=(x-y)²-(x-y)²-3x²-1/2y
=-3x²-1/2y
=-12-3/2
=-13.5