Question

Thực hiện phép tính (tính hợp lí nếu có thể): 

(-1,6) . \(\dfrac{-15}{64}\) + ( 0,8 - 2\(\dfrac{4}{15}\) ) : 3\(\dfrac{2}{3}\)

Answer 1

\(=\dfrac{-8}{5}\cdot\dfrac{-15}{64}+\left(\dfrac{4}{5}-2-\dfrac{4}{15}\right):\dfrac{11}{3}\)

\(=\dfrac{3}{8}+\dfrac{-22}{15}\cdot\dfrac{3}{11}=\dfrac{3}{8}-\dfrac{2}{5}=\dfrac{-1}{40}\)

Answer 2

\(\left(-1,6\right)\cdot\dfrac{-15}{64}+\left(0,8-2\dfrac{4}{15}\right):3\dfrac{2}{3}\)

\(=\left(-\dfrac{8}{5}\right)\cdot\dfrac{-15}{64}+\left(\dfrac{4}{5}-\dfrac{34}{15}\right):\dfrac{11}{3}\)

\(=\dfrac{3}{8}+\left(\dfrac{12}{15}-\dfrac{34}{15}\right)\cdot\dfrac{3}{11}\)

\(=\dfrac{3}{8}-\dfrac{22}{15}\cdot\dfrac{3}{11}\)

\(=\dfrac{3}{8}-\dfrac{2}{5}=\dfrac{15}{40}-\dfrac{16}{40}=-\dfrac{1}{40}\)