b) 67+58:5-316.(-2)2 =67+58.15-316⁢.4 =67+58.5-3.416 =67+18-3.2.28.2 =67+18-68 =67+(18-68) =67+-58 =6.87.8+(-5)⁢.78.7 =4856+-3556 =1356

Thực hiện phép tính: 6/7+ 5/8 *5

b) $\frac{6}{7} + \frac{5}{8} : 5 - \frac{3}{16} . {(- 2)}^{2}$