若3x-2y-5=0,那-3-9x+6y=?

若3x-2y-5=0,那-3-9x+6y=? 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=( ) y-3x=2,y-5x=4,y-7x=6,y-9x=8,y-11x=0方程组,无 （x+y-5)*（x+y-5)+（x-y+3)=0 x*x-y*y 已知:3x-5y=0,求x/y,x-y/y,x-y/x x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2 4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11 若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于 6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5 那6X+5Y=31 2X+3Y=17 6x-2y+y-y=13-7? 1.如果x与y存在3x-4y=0的关系,那x/y=（ ）,x-y/x+y=（ ）,x+y/y=（ ）2.若3x：2x+5=3x-2：2x+2,x的值? {x+y=1 ,xy=-6{x(2x-3)=0,y=x²-1{(3x+4y-3)(3x+4y+3)=0,3x+2y=5{(x-y+2)(x+y)=0,x²+y²=8{(x+y)((x+y-1)=0,(x-y)(x-y-1)=0 (5)若x/2=y/3(y不为0）则x/y=____,x+y/y=___,y/x-y=___. 若x>0,y>0,且√x(√x+√y)=3√y(√x+5√y),求2x+2√x*√y+3y/x-√x*√y+y 若5x+3y=3x+4y=x+2y+6,则x+y=___ 实数x,y满足2x+5y>=0,2x-3y>=-6,2x+y 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)