已知x,y满足条件7x-5y-23≤ 0,x+7y-11≤ 0,4x+y+10 ≥0
已知x,y满足条件7x-5y-23≤ 0,x+7y-11≤ 0,4x+y+10 ≥0,求:z=4x-3y的最值
已知x,y满足条件7x-5y-23≤ 0,x+7y-11≤ 0,4x+y+10 ≥0,求x^2+y^2的最大值
已知x,y满足条件(是一个方程组:7x-5y-23≤0,x+7y-11≤0,4x+y+10≥0.)
已知x,y满足7X-5Y-23≤0,X+7Y-11≤0,4X=Y+10≥0,M(2,1),P(x,y),(1)求(y+7
已知x,y满足条件 {4x+2y-7≥0,x-2y+2≥0,3x-y-4≤0} 试求Z=√(x^2+y^2+2X+4Y)
已知实数x,y满足条件x≥0,y≥x,3x+4y≤12,则(x+2y+3)/(x +1)的最大值是
已知实数x,y满足条件{2x-y+1≥0,2x+y≥0,x≤1,求z=x+3y的最小值.
y满足x-y+2≥0,x+y-4≥0,2x-y-5≤0 求X^2+Y^2-10Y+25的最小值
已知实数x,y满足条件2x+y≥3x+y−3≤0x≥0y≥0
若实数x,y满足条件0≤x≤10≤y≤22y−x≥1
(2012•道里区三模)已知x,y满足条件x≥0x−y+2≥02x+y−5≤0
已知有理数x、y、z满足条件|x-z-2|+(3x-6y-7)^2+|3y+3z-4|=0,求x、y、z