3x+3y+2x-2y=36,4x+4y-5x+5y=2的解

3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27 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 3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2 解方程组 求5x-2y=x-y=4x-3y-2的解 化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 已知x=1/3,y=-1/2,求代数式x-(x+y)+(x+2y)-(x+3y)+(x+4y)-(x+5y)+...-( 数学题……555{(3x+y)(3x-y)-(x-5y)(5x-y)-(x-2y)²÷(-4x),x=-2.y 关于X,Y的方程组3X+2Y=2m+5与x-y=4m-5的解x,y满足x+2y (4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuai 1.已知:x-2y=3,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]除4x 的值 3x+3y+2x-2y=36 4x+4y-5x-5y=2