{X+0.2Y-4.94=15
x+x+x=15,x+y+y=19,求y-x等于几
x+y=15 1.15x+1.1y=17
{X+2Y/2+3X-Y/3=5{0.2(X+2Y)+0.8(3X-Y)=4
解方程x+y+(x+y/2)=15 3x+5y+4(x+y/2)=62
已知2x+2y=-8,4x+y=15求(x-y)^-(3x+2y)^
10/x+y+3/x-y=-5 15/x+y-2/x-y=-1(用换元法解此方程组)
解方程组:2(x+y)-3(x-y)=34(x+y)+3x=15+3y.
解方程组 10(x-y)=3(x+y)+15 6(x+y)=4(2x-y)+16
如果y=15x,x和y成______比例;如果y=15x
解方程组x+y=15 (x+15%x+y+10%y)=17
2x+y=15 x+2y=18 x=?y=?
若2x-y=2y-x=15,则x-y=________.