若2x+3y=0,则x-3y分子x+3y的值是?

若2x+3y=0,则x-3y分子x+3y的值是? 若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于 若4y减3x等于0,则y分子x加y等于? 若3x-5y=0,则x+y/x=（）,x-y/y=（）,2x-3y/2x+3y=( ) 已知x-2y/2x+3y=3/4,则x：y=x-2y是分子2x+3y是分母 若x-y不等于0,2x-3y=0,则分式(10x-11y)/(x-y)的值是（）?(10x-11y)/(x-y) =[(8x-8y)+(2x-3y)]/(x-y) =8为什么8X-8Y=8？(10x-11y)/(x-y)=[(8x-8y)+(2x-3y)]/(x-y)=8+(2x-3y)]/(x-y)=8+0=8 若2x=3y,则(x*x+y*y)/x*x=? (5)若x/2=y/3(y不为0）则x/y=____,x+y/y=___,y/x-y=___. 若x,y满足|2x-y-3|+|3x+2y+1|=0,则x= y= 若线段x ,y 满足[2x-3y]*[3x+2y]=0 则x/y=? 若x,y满足|x-y+1|+(x+y+3)^2=0则x^2-y^2= （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 已知:X:Y=2分子1:3分子1,Y:Z=2:3,则X:Y:= 若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值 若|x+y-3|+(x-y-5)^2=0,则x)^2-y^2= 若|x|=2,|y|=3,且y/2+x《0则x+y 若[x-y+3]+|2x+y|=0,则x+y=?