(x+2y)^2+4(x+2y)+3怎么解

(x+y)(x-y)+3y^2怎么做? 4x+2y-3x-y 简写怎么写? (X-Y)^2-4(X-Y)+3怎么做, x^2-4xy+3y^2=（x-3y)(x-y)x^2-4xy+3y^2 怎么分解成（x-3y)(x-y) [4y（2x-y)-2x(2x-y)]÷（2x-y)怎么做 [(2X+Y)*(2X+Y)-Y(Y+4X)]/2X 怎么算? (x-y)^4·(x-y)-2(y-x)³·（y-x)²怎么算, 4x方y/(x-2y)(x+2y)怎么算[x方/x-2y]-4x方y/(x-2y)(x+2y)=? (x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)= 怎么化简-2(x-3y) 3(2x-y)-4(2x 3y)? (2x-3y)2-(4y-3x)(3x+4y)怎么做? 二元一次方程(x+y)/2+(x-y)/3=6,4(x+y)-5(x-y)=2怎么算 (x+3y-4)(2x-y) 计算（2x-3y)(x+4y)-(3x+y)(x-2y)（2x-3y)(x+4y)-(3x+y)(x-2y) 因式分解(x-2y)(x-3y)+(x-4y)(x-5y)+（x-3y)(x-5y)+(x-2y)(x-4y) x²/xy-x/y 3x/4x+y - x-2y/4x+y (1-y/y+x)÷x/y²-x² (2x+y)(2x-3y)+x(2y+y) 2a(x-y)-4b(x-y) x(x-y)2-(y-x)3