Question

b,15/39 * (7 4/5 * 1 * 2/3 + 8 1/3 * 7, 8)

Answer 1

\(=\dfrac{15}{39}\cdot\left(7.8\cdot\dfrac{2}{3}+\dfrac{25}{3}\cdot7.8\right)\)

\(=\dfrac{15}{39}\cdot\dfrac{39}{5}\cdot9=3\cdot9=27\)

Answer 2

\(\dfrac{15}{39}.\left(7\dfrac{4}{5}.1\dfrac{2}{3}+8\dfrac{1}{3}.7,8\right)\)

\(=\dfrac{15}{39}.\left(7,8.1\dfrac{2}{3}+8\dfrac{1}{3}.7,8\right)\)

\(=\dfrac{15}{39}.\left[7,8.\left(1\dfrac{2}{3}+8\dfrac{1}{3}\right)\right]\)

\(=\dfrac{15}{39}.\left[7,8.\left(1+8\right)\left(\dfrac{2}{3}+\dfrac{1}{3}\right)\right]\)

\(=\dfrac{15}{39}.\left(7,8.9\right)\)

\(=\dfrac{15}{39}.70,2\)

\(=27\)