[(2X-Y)²-Y(4X+Y)-8X]÷2X
1个回答
=[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
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