Помогите решить,два примера!!! а) 58/13 : 29/65 * 17/80= б) 42*(1/3 + 3/4 -5/12)=

1.
$\frac{58}{13} \div \frac{29}{65} \times \frac{17}{80} = \\ \frac{58}{13} \times \frac{65}{29} \times \frac{17}{80} = \\ 2 \times 5 \times \frac{17}{80} = \\ 5 \times \frac{17}{40} = \\ \frac{17}{8} = 2 \frac{1}{8 } = 2.125$
2.
$42( \frac{1}{3} + \frac{3}{4} - \frac{5}{12} ) = \\ 42 \times \frac{2}{3} = \\ 14 \times 2 = 28$