化简求值 [(x-y^2)+(x+y)(x-y)]÷2x.
化简求值 [(x-y^2)+(x+y)(x-y)]÷2x.
化简求值:[(x+y)(x-y)-(x-y)²+2y(x-y)]÷4y,其中x=二分之一,y=2
化简求值:x/[9(x-y)^2]*[(x^2-y^2)/(x+y)]+{[(x^2+2)/(x+y)]-2}
化简求值(2x+3y)平方-( 2x+y)(2x-y)
化简求值【(x+2Y)的平方-(x+Y)(3x-Y)-5y的平方】÷(2x),其中x=-2,y=2/1
化简求值:(x+y)(x-y)+(x-y)²-(6x²y-2xy²)÷2y,其中x=-2,
化简求值:[(3x-1\2y)^2+3y(x-y\12)]÷[(2x+y)^2-4y(x+1\4y)]
化简求值:已知【3x分之2-x+y分之2(3x分之x+y-x-y)】÷5x+3y=0
化简求值:[2x的平方-(x+y)(x-y)][(-x-y)(y-x)+2y的平方],其中x=1,y=2
化简求值 【2x²-(x+y)(x-y)][(x+y-1)(x-y+1)+1-2y],其中x=-1,y=-2
化简求值:[23x−2x+y(x+y3x−x−y)]÷x−yx
化简求值:2(x-2y)^2-4(x-2y)+(x-2y)^2-3(x-2y),