若x-y≥0,2x+y-3≥0,求8x+y-1的最小值

若x-y≥0,2x+y-3≥0,求8x+y-1的最小值 求y=(x^2)+2x(x≥0) y=-x+2x(x 已知:3x-5y=0,求x/y,x-y/y,x-y/x 已知x,y满足x+y-6≤0,x+2y-8≤0,2x-3y-6≤0,x≥0,0≤y≤3,求(3y-12)/(x-6)的最大值和最小值. 若x≥0,y≥0,且2x+3y≤100,2x+y≤60,求z=6x+4y的最大值? 若x,y满足条件2x-y≥0,2x+3y≤8,y≥0,则z=x+3y的最大值为 若根号x+y-3+绝对值xy+x+y-2=0,求x/y+y/x根号x+y-3+绝对值xy+x+y-2=0,求x/y+y/x x*x+2x-y*y+6y-8=0,x+y不等于2,求x-y的值 已知X*X+Y*Y+6X-8Y+25=0 求（Y/X)+(X/Y)-2=? 若X大于0求|X-Y+2|-|y-x-3|的值y小于0 若x大于0,y小于0,求|x-y+2|-|y-x-3| 若x+y+3=0,求2/3-2x-2y+(-x-y)^2 若2x-3y=0,求5x+4y/3x-2y 若／X+Y-9／+（2X-Y+3)=0求X与Y的值 若x,y为正数,且2*x+8*y-x*y=0,求x+y的最小值 若X,Y互为相反数,且(X+Y+3)(X-Y-2)=0,求X,Y的值? 求f(x,y)=x+y+7的最大值,使(x,y)满足x+2y≤10,2x+y≥6,y≥0 若(x*x+y*y)(x*x+y*y)-4x*x*y*y=0,求代数式(x*x+5xy+y*y)/(x*x+2xy+y*y)的值