[(2X-Y)²-Y(4X+Y)-8X]÷2X
问题描述:
[(2X-Y)²-Y(4X+Y)-8X]÷2X
其中X=-1,Y=2
化简求值
答
=[4x²-4xy+y²-4xy-y²-8x]/2x
=(4x²-8xy-8x)/2x
=2x-4y-4
x=-1,y=2时
2x-4y-4
=-2-8-4
=-14