Question

1-5с/5 : 40-8/8c
решите пожалуйстааа

Answer 1

$1 - \frac{5c}{5} \div 40 - \frac{8}{8c} = 1 - \frac{5c}{5} \times \frac{1}{40} - \frac{8}{8c} = 1 - \frac{c}{40} - \frac{8}{8c} = \frac{40 - c}{40} - \frac{1}{c} = \frac{c(40 - c) - 40}{40c } = \frac{40c - {c}^{2} - 40}{40}$