正方形=(8.2×2+1.7×3)÷(3×3-2×2)=4.3三角形=(8.2+2×4.3)÷3=5.6
∵3a-2b=8.2 3b-2a=1.7∴9a-6b=24.6 6b-4a=3.4∴5a=28 a=5.6∴b=4.3所以三角形=5.6 正方形=4.3