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Answer and explanation of question 8 on page 37 of mathematics book of Tianjin primary school fifth grade people's Education Press There is no wonder in the world. Alas~~~
7. 50 △ 2 = 25 (m)
50 × 25 + (50 × 2.5 + 25 × 2.5) × 2 = 1625 (M2)
8. (8 × 6 + 8 × 3 + 6 × 3) × 2-11.4-8 × 6 = 120.6 (M2)
120.6 × 4 = 482.4 yuan
9. 65-10 = 55 (CM)
Yellow paint: (40 × 55 + 40 × 65 + 40 × 40) × 2 = 6400 (cm2)
Red paint: 40 × 65 + 40 × 10 + 40 × 40 × 4 + 40 × (65-40) = 10400 (cm2)
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