(x+2y)^2-2(x+2y)+1怎么分解因式?,

X^2Y+Y=X^怎么转换成X^=1-Y分之Y 2xy/(x+y)(x+y)与x/(x+y)(x-y)怎么通分 x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 [(-x-y)(-x+y)-(x+y)^2-x(y-y^2)}÷1/2y (x+y)(x-y)+3y^2怎么做? x-y+2y的平方/x+y怎么算? (2x+y-1)(2x+y-1)怎么算 (2x-y+1)(2x+y+1)怎么做? (2x+y+1)(2x+y-10)怎么做 （x+y）(x-1)-xy-y^2 怎么因式分解? (x/y)2-(x/y)=1怎么解? 化简y(x+y)+(x+y)(x-y)-x^2 对于(y一撇）y`=y/x(y-1)求导,我求的结果是y``=-y^2-y`x+y/x^2(y-1)^2 怎么不对啊,我的求导过程是：y`x(y-1) - [x(y-1)]` y y`xy-y`x-(y-1+xy`)y -y^2-y`x+yy``=-------------------------=----------------------=-----------------x^2 (y-1 matlab画几个二元函数x*y/(x^2+y^2)^0.51/(x+y)x*y/(x+y)1/(x*y)sin(x+y)sin(x*y)sin(x)+sin(y)这么多,回答了再加分怎么设置上下限? [4y（2x-y)-2x(2x-y)]÷（2x-y)怎么做 [(2X+Y)*(2X+Y)-Y(Y+4X)]/2X 怎么算? (x-y)(x+y)-(x-2y)(2x+y)请问怎么化简. (x-y)^4·(x-y)-2(y-x)³·（y-x)²怎么算,