已知实数x,y满足条件x-y+1≥0,y+1≥0,x+y+1≤0,求(1)Z=2x-3y+4的最大值

问题描述:

已知实数x,y满足条件x-y+1≥0,y+1≥0,x+y+1≤0,求(1)Z=2x-3y+4的最大值
(2)K=(y-4)/(x-1)的取值范围(3)v=x²+y²的最小值

y-x-1