[3x^2-2x(x+y)+y(2x-y)]÷(x+y),其中X=1/2,y=1/3 先化简,在求值

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[3x^2-2x(x+y)+y(2x-y)]÷(x+y),其中X=1/2,y=1/3 先化简,在求值
[3x^2-2x(x+y)+y(2x-y)]÷(x+y),其中X=1/2,y=1/3 先化简,在求值

[3x^2-2x(x+y)+y(2x-y)]÷(x+y),其中X=1/2,y=1/3 先化简,在求值
[3x^2-2x(x+y)+y(2x-y)]÷(x+y)
=[3x^2-2x^2-2xy+2xy-y^2]÷(x+y)
=(x^2-y^2)÷(x+y)
=(x+y)(x-y)÷(x+y)
=x-y
=1/2-1/3
=1/6

[3x^2-2x(x+y)+y(2x-y)]÷(x+y)
=[x(3x-2x-2y)+y(2x-y)]÷(x+y)
=[x(x-2y)+y(2x-y)]÷(x+y)
=[x^2-2xy+2xy-y^2)]÷(x+y)
=[]x^2-y^2]÷(x+y)
=(x+y)(x-y)÷(x+y)
=(x-y)
=1/2-1/3
=1/6

原式=（3x^2-2x^2-2xy+2xy-y^2)/(x+y)=(x^2-y^2))/(x+y)=x-y

x(x-y)2-(y-x)3 x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 [2/3x-2/x+y(x+y/3x-x-y)]/x-y/x 化简：{2/3x-2/(x+y)[(x+y)/3x-x-y]}/(x+y)/x 计算2/3x-2/x+y(x+y/3x-x-y)/x-y/x 化简3x-2/(x+y)[(x+y)/3x-x-y]÷(x-y)/x 化简y(x+y)+(x+y)(x-y)-x^2 因式分解x(x+y)(x-y)-x(x+y)^2 计算：x+2y/x-y+2x/y-x-3y/x-y 化简:(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方 [(3x+y)(x-y)-(2x+3y)(x-y)]*(x-y) (x+y)(x-y)-(x-y)^2如题 (x+y)(x-y)-(x-y)^2 【2(x-y)(x-y)(x-y)-8(x-y)(x-y)(x+y)+6y(x-y)(x-y)]/2(x-y)(x-y) 2X(2X-3Y)-3Y(X+Y) (-2x y)^2-(3y-x)(-x-3y) （x+2y)^2-(x+y)(3x-y) 计算(x+y)(x+y)^2(-x-y)^3 化简:5(x-y)+2(x+y)-3(x-y)