{(2x+y)2-y(y+4x)-8x}÷(2x)其中x=-2
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{(2x+y)2-y(y+4x)-8x}÷(2x)其中x=-2{(2x+y)2-y(y+4x)-8x}÷(2x)其中x=-2{(2x+y)2-y(y+4x)-8x}÷(2x)其中x=-2将x=-2代入
{(2x+y)2-y(y+4x)-8x}÷(2x)其中x=-2
{(2x+y)2-y(y+4x)-8x}÷(2x)其中x=-2
{(2x+y)2-y(y+4x)-8x}÷(2x)其中x=-2
将x=-2代入上式得
{ (-4+y)²-y(y-8)+16 }÷(-4)
={ (16-8y+y²)-(y²-8y) +16 }÷(-4)
=(16-8y+y²-y²+8y +16 )÷(-4)
=32÷(-4)
=-8
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