Question

2x3/7+(2/9-10/7)-5/3:1/9

cái này là phép tính (tính nhanh nếu có thể)

Answer 1

\(2×\dfrac{3}{7}+\left(\dfrac{2}{9}-\dfrac{10}{7}\right)-\dfrac{5}{3}:\dfrac{1}{9}\)

\(=\dfrac{6}{7}+\dfrac{2}{9}-\dfrac{10}{7}-15\)

\(=\left(\dfrac{6}{7}-\dfrac{10}{7}\right)+\dfrac{2}{9}-15\)

\(=-\dfrac{4}{7}+\dfrac{2}{9}-15\)

\(=-\dfrac{22}{63}-15\)

\(=-\dfrac{967}{63}\)

Answer 2

\(2x.\dfrac{3}{7}+\left(\dfrac{2}{9}+\dfrac{10}{7}\right)-\dfrac{5}{3}:\dfrac{1}{9}\)

\(\Leftrightarrow2x\dfrac{3}{7}+\dfrac{2}{9}-\dfrac{10}{7}-\dfrac{5}{3}:\dfrac{1}{9}\)

\(\Leftrightarrow\dfrac{6x}{7}+\dfrac{2}{9}-\dfrac{10}{7}-\dfrac{5}{3}:\dfrac{1}{9}\)

\(\Leftrightarrow\dfrac{6x}{7}+\dfrac{2}{9}-\dfrac{10}{7}-15\)

\(\Leftrightarrow\dfrac{6x}{7}-\dfrac{1021}{63}\)