若x-(5+2y)=12,则3x-6y=
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
若5x+3y=3x+4y=x+2y+6,则x+y=___
若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7
若3x-5y=0,则x+y/x=(),x-y/y=(),2x-3y/2x+3y=( )
若x-2y=5,则式子12-x+2y=.以知3x-4y=2x+y则x∶y=
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
若|5x+2y-12|+(3x-2y-6)平方=0,则x+2y=?
若(5X+2Y-12)(5X+2Y-12)+|3x+2y-6|=0,则2x+4y=?
若|5x+2y-12|+(3x+2y-6)(3x+2y-6)=0,则2x+4y=
解方程组:x+y/2+x-y/3=6 4(x+y)-5(x-y)=12
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
若x/y=4/3 则3x+2y/2x-5y=