化简求值:12x−2(x−y
化简求值:12x−2(x−y
化简求值:[23x−2x+y(x+y3x−x−y)]÷x−yx
化简求值 [(x-y^2)+(x+y)(x-y)]÷2x.
化简求值:(x+y)-(2x+1/2y)-(3x+1/6y)-(4x+1/12y)-(5x+1/20y)-.(10x+1
化简求值:x/[9(x-y)^2]*[(x^2-y^2)/(x+y)]+{[(x^2+2)/(x+y)]-2}
一、 化简求值1 (x-2-(12)/(x+2))/(4-x)/(x+2)2【(x-y)²+(x+y)(x-y
化简求值:1x+2−x
化简求值(2x+3y)平方-( 2x+y)(2x-y)
化简求值:[(3x-1\2y)^2+3y(x-y\12)]÷[(2x+y)^2-4y(x+1\4y)]
先化简后求值:(x-y)(y-x)-[x2-2x(x+y)],其中x=12,y=−2
化简求值:[(x+2y)2-(x+y)(3x-y)-5y2]÷2x,其中x=-2,y=12
化简求值:2(x-2y)^2-4(x-2y)+(x-2y)^2-3(x-2y),