若实数x,y满足x-y+1>=0,x+y>=0,x
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若实数x,y满足x-y+1>=0,x+y>=0,x
结合题目所给的不等式组,作出可行域【x-y+1≥0,x+y≥0,x≤0】,则x+2y在这个可行域内的最大值是2,最小值是0,则3^(x+2y)的最大值是3²=9,最小值是1.
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