已知X-5Y=-3,则15-2Y+10Y=
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
已知x/5=y/3,则(x/x+y)+(y/x-y)-(yxy/xxx-yxy)
已知x*x+4x+y*y-2y+5=0,则x*x+y*y=?
已知x-y-3绝对值+(2x+2y+10)的平方=0,则(x+y)(x-Y)=
已知x,y满足约束条件{2x+5y>=10,2x-3y>=-6,2x+y
已知X-Y/X+Y=3,求代数式2(x-y)/X+Y-3X+Y/X+Y
已知x/1-y/1=3,则5x+xy-5y/x+2y-y的值为
已知xy/x+y=2,则代数式3x-5y+8y/-x+3xy-y的值
已知x-5y=0(y≠0),则代数式2x-3y/3x+6y
已知x-y=-3y+5,则式子x+2y-1的值是?
已知20(x+2y)=15(y+3Z)=12(z+5x),则x:y
已知3X=5Y,则X:Y=