设从两个供应地到三个需求地的运量(吨)如下表: B B B A X X 3 A X minz=2x11+3X12+5X13+4X21+7X2+8X2 23 st.x11+x12+x13 =35供应地A1 21^2223 =25供应地A2 X x21 10需求地B1 X 12 X22 =30需求地B2 13 +x23=20需求地B3 X132X1232X13,X21,X22x2320设从两个供应地到三个需求地的运量（吨）如下表： B1 B2 B3 A1 x11 x12 x13 A2 x21 x22 x23 • min z=2x11+3x12+5x13+4x21+7x22+8x23 • s.t. x11+x12+x13 =35 供应地A1 • x21+x22+x23 =25 供应地A2 • x11 +x21 =10 需求地B1 • x12 +x22 =30 需求地B2 • x13 +x23 =20 需求地B3 • x11 , x12 , x13 , x21 , x22 , x23≥0