若x-3y=-5,则2x+3-6y=

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3x-5y=0,则x+y/x=（）,x-y/y=（）,2x-3y/2x+3y=( ) x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2 6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5 若2x-3y+4=0则x（x*x-1)+x(5-x*x)-6y+7 (5)若x/2=y/3(y不为0）则x/y=____,x+y/y=___,y/x-y=___. 若2x=3y,则(x*x+y*y)/x*x=? 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 若(3x-2y)/(x+y)=2/3,则3x/5y= 若x^2-y^2=6 x+y=3 则x-y=多少 若x/y=4/3 则3x+2y/2x-5y= 若2x+2y=6x-3y,则x比y= 若|x+y-3|+(x-y-5)^2=0,则x)^2-y^2= 若x、y互为相反数,且2x-3y=5,则x+y=? 若3x=5y,则x:y=________,(x-y):y=______ 【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2= 若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值