已知X,Y满足3|2X-Y|+（Y-1/3）的平方=0,求3X-7Y的值

已知X和Y满足3X+4Y=2,X-Y-1/7 已知x,y满足y 已知X,Y满足|X-Y-1|+（X+Y-3)^2=0求X,Y的值 已知变量x,y满足约束条件x+2y-3=0,y-1 已知变量x,y满足约束条件x+2y-3=0,y-1 已知实数x,y满足约束条件x+y>3,y 已知x、y满足2/1|x-y|+|1-y|=0,求7x-3y的值 已知：x,y满足|2x-y|+|y-1/2|=0,求7x-3y的值. 已知x,y满足约束条件：x-y+1>=0,x+y-2>=0,x 变量x,y满足约束条件,x+y>=3,x-y>=-1,2x-y 已知x=3y+2,且满足4y 已知x=3y+2,且满足4y 已知实数x,y满足x^+y^+2x-2根号3y=0(1)x^+y^的最大值 （2）x+y的最小值 已知x.y满足(x-y-2≤0,x 2y-5≥0,y-2≤0 则3x+y/x+1得多少 已知实数x,y满足,X-2y≥-4,3x-2y≤12,x+y≥2,则y/(x+1)的取值范围 已知实数x y z满足x/(x+1)=y/(y+2)=z/(z+3)=(x+y+z)/3,求x+y+z的值 已知实数x y z满足x/(x+1)=y/(y+2)=z/(z+3)=(x+y+z)/3,求x+y+z的值 已知变量x满足约束条件1：x-y+2=1；3:x+y-7