y=2/5x-1/37/5 与y=-2/3x-
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
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
(3x+2y)+(5x-y)i=17-2i.求x与y
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
y=2/5x-1/37/5 与y=-2/3x-
已知x=1/3,y=-1/2,求代数式x-(x+y)+(x+2y)-(x+3y)+(x+4y)-(x+5y)+...-(
(2x+y-1)(2x-y+1)-(3x+y)(3x-y),其中x=5分之1,
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
已知|2x+y-1|+(3x-2y-5)²=0,求x与y的值
已知|2x+y-1|+(3x-2y-5)的平方=0,求x与 y的值
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