Question

Calculati:a=(9×1\4-7×2\5):7×2\5

Answer 1

$(9* \frac{1}{4} -7* \frac{2}{5} ):7* \frac{2}{5} =( \frac{9}{4} - \frac{14}{5}):7* \frac{2}{5} =- \frac{11}{2} :7* \frac{2}{5} =- \frac{11}{14} * \frac{2}{5} =- \frac{22}{70}$$=- \frac{11}{35} .$