若|3X+1|+|Y+2|=0,则3X—Y=多少

若2x-3y+4=0则x（x*x-1)+x(5-x*x)-6y+7 若y=x(x-1)(x-2)(x-3),则y′（0）= 若x,y满足|2x-y-3|+|3x+2y+1|=0,则x= y= 若x,y满足|x-y+1|+(x+y+3)^2=0则x^2-y^2= 若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值 若3x-5y=0,则x+y/x=（）,x-y/y=（）,2x-3y/2x+3y=( ) 若x+y=4,则多项式1/2(x+y)+4(x-y)-3（x-y）-3/2(x+y)-x+y值是（） 若2x=3y,则(x*x+y*y)/x*x=? 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(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于 若x^3+x^2+x+1=0,则y=x^97+x^98+.+x^103 若2x^2-3x+1+y=0,则x+y的最大值 若实数X,Y满足{ x-y-1≤0,x+y-3≤0,x≥1,则函数z=2x-y的最大值 若变量x y满足约束条件x+y≤5 x-y≤-1 x≥0 则z=3x-2y的最小值 若线段x ,y 满足[2x-3y]*[3x+2y]=0 则x/y=? 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=?