Solution: 1 m = 100 cm. 1 cm = 10 mm. ∴ 1 m = 100 × 10 = 1000mm. Now, 1 km = 1000 m. ∴ 1 km = (1000 × 100)cm = 100000 cm = (100000 × 10)mm = 1000000mm.
確定! 回上一頁