【(x+2y)2-(x+y)(3x-y)-5y2】÷(2x);其中 x=-2 y=2/1 (二分之一) 先化简后求值
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【(x+2y)2-(x+y)(3x-y)-5y2】÷(2x);其中 x=-2 y=2/1 (二分之一) 先化简后求值
【(x+2y)2-(x+y)(3x-y)-5y2】÷(2x);其中 x=-2 y=2/1 (二分之一) 先化简后求值
【(x+2y)2-(x+y)(3x-y)-5y2】÷(2x);其中 x=-2 y=2/1 (二分之一) 先化简后求值
【(x+2y)2-(x+y)(3x-y)-5y2】÷(2x)
=[x^2+4xy+y^2-(3x^2+2xy-y^2)-5y^2]/(2x)
=[-2x^2+2xy]/(2x)
=y-x
=1/2-2
=-3/2
gftfdtgertewrwe
2(x-y)²-3(x-y)(-y-x)
x(x-y)2-(y-x)3
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
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2分之x+y+3分之x-y;4(x+y)-(x-y)谢谢了,
化简y(x+y)+(x+y)(x-y)-x^2