2x+3y=-5,3x-4y=18的解

求5x-2y=x-y=4x-3y-2的解 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 3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2 4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11 3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27 先化简再求值(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y) x=4 y=5 证明：代数式[(x+y)(x-y)-(x+y)^2-2y(x-y)-2xy]/xy 的值为x,y的值无关 解方程 (x+1)^5/(-1-x)^4=3x+7一定要100%正确阿. 解方程组 10（x-y)=3(x+y)+15 6(x+y)=4(2x-y)+1610（x-y)=3(x+y)+156(x+y)=4(2x-y)+16分开的。 (x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)= 如果方程组x-y=a-3,2x+y=5的解x、y满足x>0,y 已知x-y=1,求[(x+2y)^2+(2x+y)(x-4y)-3(x+y)(x-y)]除以y的值大神们帮帮忙 已知x-y=1,求[(x+2y)²+(2x+y)(x-4y)-3(x+y)(x-y)]÷y的值 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 若x、y、z满足2x+3y+z=18,4x-3y+5y=24,求x+3y的值. 3(x+y)+4(x-y)=36 2(x+y)=-10的解! 1.已知:x-2y=3,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]除4x 的值 已知x-2y=2011,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]÷4x的值. 化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1