若3x-2y-5=0,那-3-9x+6y=?

若3x-5y=0,则x+y/x=（）,x-y/y=（）,2x-3y/2x+3y=( ) 若2x-3y+4=0则x（x*x-1)+x(5-x*x)-6y+7 6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5 若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于 y-3x=2,y-5x=4,y-7x=6,y-9x=8,y-11x=0方程组, 那6X+5Y=31 2X+3Y=17 6x-2y+y-y=13-7? 若4x^2-4x+9y^2-12y+5=0求6x+2/3y 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) x+y=3 x+2y=9 3/x+1=y y-x=3 y=2x-3 y-3x=1 2(x+1)-y=6 7x-5y=-9 若5x+3y=3x+4y=x+2y+6,则x+y=___ 若2x-3y=0,求5x+4y/3x-2y 求解 3x=6y-2 3x-4y=2 6x-3y=-5 4x-9y+1=0 4(2x+y)-5(2x-y)=3 2(2x