Tính (1 1/4).(-8/15)-3/5+2/5.(-3/4)

* Hướng dẫn giải

$\left(1\frac{1}{4}\right).\left(-\frac{8}{15}\right)-\frac{3}{5}+\frac{2}{5}.\left(-\frac{3}{4}\right)=\left(\frac{5}{4}\right).\left(-\frac{8}{15}\right)-\frac{3}{5}-\frac{3}{10}=\left(-\frac{2}{3}\right)-\frac{3}{5}-\frac{3}{10}=-\frac{47}{30}$