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在平面直接坐標系中,作出三條直線x+y+2=0,x+2y+1=0,2x+y+1=0,圍成一個三角形,如圖所示,三角形區域(包括邊界)用不等式(組)可表示為:x+y≥−22x+y≤−1x+2y≤−1.故答案為:x+y≥−22x+y≤−1x+2y≤−1.
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