化简求值(2x+3y)²-(2x+y)(2x-y)
化简求值(2x+3y)平方-( 2x+y)(2x-y)
化简求值:【(x+2y)²-(x+y)(3x-y)-5y²]/2x,其中x=-2,y=二分之一详细过
化简下列各式,并求值:3(x-y)²-7(x-y)+8(x-y)²+6(x-y) 其中x=2,y
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:x-y/x²-2xy+y²-xy+y²/x²-y²,其中(x
化简求值:2(x-2y)^2-4(x-2y)+(x-2y)^2-3(x-2y),
(x+y)(x-2y)(x²-4y²) 其中x=8 y=-8 化简求值
化简求值:(x+2y)²-(x+y)(x-y),其中x=-2,y=二分之一
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 [(x-y^2)+(x+y)(x-y)]÷2x.
化简求值(x+2y)^2-(2x+y)(2x-y)-5y(y-x) 其中 x=1/3 y= -1/2
化简求值:(2x²y-2xy²)-【(-3x²y²+3x²y)】,其中