Đáp án:

Giải thích các bước giải:

**Bài 4: Đổi đơn vị diện tích**

a) \(65\, \text{cm}^2 = \frac{65}{100}\, \text{dm}^2 = 0.65\, \text{dm}^2\)

d) \(48000\, \text{mm}^2 = \frac{48000}{1000000}\, \text{m}^2 = 0.048\, \text{m}^2\)

b) \(120\, \text{m}^2 = \frac{120}{100}\, \text{dam}^2 = 1.2\, \text{dam}^2\)

e) \(11\, \text{m}^2\, 25\, \text{dm}^2 = 11\, \text{m}^2 + \frac{25}{100}\, \text{m}^2 = 11.25\, \text{m}^2\)

c) \(74\, \text{m}^2 = \frac{74}{10000}\, \text{hm}^2 = 0.0074\, \text{hm}^2\)

f) \(25\, \text{hm}^2\, 500\, \text{m}^2 = 25\, \text{hm}^2 + \frac{500}{10000}\, \text{hm}^2 = 25.05\, \text{hm}^2\)

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**Bài 5: Đổi đơn vị thể tích**

a) \(500\, \text{dm}^3 = \frac{500}{1000}\, \text{m}^3 = 0.5\, \text{m}^3\)

d) \(6\, \text{dm}^3\, 200\, \text{cm}^3 = 6\, \text{dm}^3 + \frac{200}{1000}\, \text{dm}^3 = 6.2\, \text{dm}^3\)

b) \(200\, \text{cm}^3 = \frac{200}{1000}\, \text{dm}^3 = 0.2\, \text{dm}^3\)

e) \(620\, \text{lít} = 620\, \text{dm}^3 = \frac{620}{1000}\, \text{m}^3 = 0.62\, \text{m}^3\)

c) \(7260\, \text{dm}^3 = \frac{7260}{1000}\, \text{m}^3 = 7.26\, \text{m}^3\)

f) \(3\, \text{m}^3\, 10\, \text{dm}^3 = 3\, \text{m}^3 + \frac{10}{1000}\, \text{m}^3 = 3.01\, \text{m}^3\)