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Giải
5 đoạn dài số mét là:
14 x 5 = 70 (mét)
Sợi dây còn lại dài số mét là:
81 - 70 = 11 (m)
Đáp số: 11 m
Giải
Phân số biểu diễn số con gà mái là:
\(\dfrac{5}{5}\) - \(\dfrac{1}{5}\) = \(\dfrac{4}{5}\) (số gà mái)
Đàn gà đó có số con gà mái là:
40 x \(\dfrac{4}{5}\) = 32 (con gà mái)
Đáp số: 32 con gà mái
Khi x ⋮ 15, x ⋮ 18 và nhỏ nhất khác 0 ⇒ x là BCNN(15,18)
Ta có: 15 = 3.5
18 = 2.32
BCNN(15,18) = 32.5.2 = 90
Vậy x = 90