若| x-1| +2|y+3 |=0,则x+y的值是多少

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（） 若根号x+y-1+(y+3)^2=0,则x+y的平方根是? 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 (5)若x/2=y/3(y不为0）则x/y=____,x+y/y=___,y/x-y=___. 若x+y=1,x不等于0则x+(2xy+y^2)/x/(x+y)/x= 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2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值 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2x^2-3x+1+y=0,则x+y的最大值 若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于 若x>0,y>0且x+2y=3 则1/y+1/y的最小值是 若|x+y-3|+(x-y-5)^2=0,则x)^2-y^2=