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The surface area of the cuboid is 100 square meters It is 2.5 meters long and 2 / 5 meters wide. It is high
1: (12-2) △ 2 / 5 = 25 (g) 25g = 0.025kg
2.（16+10）÷10=5/13
3.100 - (2.5 × 2 / 5 × 2) = 98 (M2) 98 △ 2 △ 2 (2.5 + 2 / 5) = 490 / 29 (m)
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