Question

11．三個(gè)筑路隊(duì)同時(shí)修一條公路，甲隊(duì)修了600米，乙隊(duì)修的相當(dāng)于甲隊(duì)的$\frac{4}{5}$，丙隊(duì)修的相當(dāng)于乙隊(duì)的$\frac{5}{6}$，丙隊(duì)修了多少米？

Answer 1

分析 此題把甲隊(duì)修的米數(shù)看作單位“1”，則乙隊(duì)修的相當(dāng)于單位“1”的$\frac{4}{5}$，根據(jù)求一個(gè)數(shù)的幾分之幾是多少用乘法解答，再把乙隊(duì)修的米數(shù)看作單位“1”，則丙隊(duì)修的米數(shù)相當(dāng)于單位“1”的$\frac{5}{6}$，用分?jǐn)?shù)乘法進(jìn)一步得解．

解答 解：600×$\frac{4}{5}$×$\frac{5}{6}$
=480×$\frac{5}{6}$
=400（米）
答：丙隊(duì)修了400米．

點(diǎn)評(píng) 此題主要考查了求一個(gè)數(shù)的幾分之幾是多少用乘法求解．解答此題的關(guān)鍵是分別把甲隊(duì)修的米數(shù)、乙隊(duì)修的米數(shù)看作單位“1”，再用分?jǐn)?shù)乘法解答．