[X/(y+30)]*y=4.5和[X/(0.5y+30)]*0.5y=3
解方程组:(0.2x+0.1y)/2- (4x-y)/10=(x-y)/5+ (3x+0.5y)/30 (3x+2y-1
|x|=3 |y|=5 |x-y|=|x|+|y| 求 X+Y和 X-Y 等于多少
x+y=127 0.5x+0.8y=83 求x和y
4x+2y=22 4x+y=30 求x和y
x和y是非零实数,如果(2x-y)/3y=y/x,那么x/y=?
x+y=20-6 3x+y=30
5(x+y)+3(x-y)=90 5(x+y)-3(x-y)=30,解二元一次方程组
已知X-Y/X+Y=3,求代数式2(x-y)/X+Y-3X+Y/X+Y
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
|x|+|y|=30 2|x|-3|y|=20 求x,y
x+y=17 x+x+y+y+y+y=44问x和y各是多少
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=