Tính a) (0,375 - 1 1/2) : 4 + 1 b) 10 3/5 . 7/9 - 13 3/5 . 7/9

* Hướng dẫn giải

a) $\left(0,375-1\frac{1}{2}\right):4+1=\left(\frac{3}{8}-\frac{3}{2}\right).\frac{1}{4}+1$$=\left(-\frac{9}{8}\right).\frac{1}{4}+1=\frac{23}{32}$

b) $10\frac{3}{5}.\frac{7}{9}-13\frac{3}{5}.\frac{7}{9}=\frac{7}{9}.\left(10\frac{3}{5}-13\frac{3}{5}\right)$$=\frac{7}{9}.\left(-3\right)=-\frac{7}{3}.$