Thực hiện các phép tính: a) (26,05 + 132,5) +4,28 b) (15,37

* Hướng dẫn giải

a) $\left(26,05+132,5\right)+4,28=158,55+4,28=162,83$

b) $\left(15,37-13,37\right).0,12=2.0,12=0,24$

c) $\left(-1,2\right).\frac{-3}{24}+\left(0,4-1\frac{4}{15}\right):1\frac{2}{3}=\frac{-12}{10}.\frac{-3}{24}+\left(\frac{2}{5}-\frac{19}{15}\right):\frac{5}{3}$$=\frac{-6}{5}.\frac{-1}{8}+\left(\frac{6}{15}-\frac{19}{15}\right).\frac{3}{5}$$=\frac{3}{20}+\frac{-13}{15}.\frac{3}{5}=\frac{3}{20}-\frac{39}{75}=-\frac{111}{300}$