Question

[Hoàng Đỗ Việt]

Câu 2: Tìm số nguyên x, biết rằng:

\(\dfrac{3}{7}.15\dfrac{1}{3}+\dfrac{3}{7}.5\dfrac{2}{5}\le x\le\left(3\dfrac{1}{3}:7-6\dfrac{1}{2}\right).\left(-2\dfrac{1}{3}\right)\)

Answer 1

[Nguyễn Lê Phước Thịnh]

\(\Leftrightarrow\dfrac{3}{7}\left(\dfrac{46}{3}+\dfrac{12}{5}\right)< =x< =\left(\dfrac{10}{3}:7-\dfrac{13}{2}\right)\cdot\dfrac{-7}{3}\)

\(\Leftrightarrow\dfrac{38}{5}< =x< =\dfrac{253}{18}\)

mà x là số nguyên

nên \(x\in\left\{8;9;10;11;12;13;14\right\}\)