Question

[Đặng Hồng Đăng]

14/20< ?/26<15/20

Answer 1

[Nguyễn Thị Thương Hoài]

\(\dfrac{14}{20}\) < \(\dfrac{?}{26}\) < \(\dfrac{15}{20}\)

\(\dfrac{14\times13}{20\times13}\) < \(\dfrac{x\times10}{26\times10}\) < \(\dfrac{15\times13}{20\times13}\)

14 \(\times\) 13 < \(x\times10\) < 15 \(\times\) 13

    182   < \(x\) \(\times\) 10 < 195

    \(\dfrac{182}{10}\) < \(x\) < \(\dfrac{195}{10}\)

    18,2 < \(x\) < 19,5

Vì \(x\) là số tự nhiên nên \(x\) = 19 

Answer 2

[Trịnh Ngọc Hiếu]

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