怎么化简{[x^2+(y+3)^2]^1/2}+{[x^2+(y-3)^2]^1/2}=10?

先化简再求值(x-y)(x+y)-(x-2y) 的完全平方+x(3x-5y)-(x-y)(x-2y),其中x=1/2 y 化简求值(x+2y)^2-(2x+y)(2x-y)-5y(y-x) 其中 x=1/3 y= -1/2 (3x-y)^2+(3x+y)(3x-y),x=1,y=-2 化简求值{(x=2y)(5x-2y)-(3x+2y)(3x-2y)]/4x,其中x=2,y=-1 {3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1 化简求值:(x+y)-(2x+1/2y)-(3x+1/6y)-(4x+1/12y)-(5x+1/20y)-.(10x+1 2(x+y) 3x+3y=24 x+y/2x x y/2y= 1 1、x(x-y)(x+y)-x(x+y)^2 化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1 因式分解 (1)6(x-y)^3-3y(y-x)^2 (2)x(x-y)(a-b)-y(y-x)( 化简求值：(7x-2y)(3x-2y-1)-(4x+3y)(9x+6y),其中x=2,y=-1 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