Tính: a) 38,6 + 42,78 * 1,6 : 0,001 ; b) 4,36 + 13,734 : 13,08 -1,82

* Hướng dẫn giải

a)

$\begin{array}{l}38,6+42,78\times 1,6:0,001\\ =38,6+42,78\times 1600\\ =38,6+68448\\ =68486,6\end{array}$

b)

$\begin{array}{l}4,36+13,734:13,08-1,82\\ =4,36-1,82+1,05\\ =2,54+1,05\\ =3,59\end{array}$