(54*13\14)*7\13 (46*2\15)*15\23 (12\13*14\17)*(17\14*13\24) 48*5\17+48*12\17...

1)
$\frac{54 \times 13}{14} \times \frac{7}{13} = \frac{54}{2} = 27$
2)
$\frac{46 \times 2}{15} \times \frac{15}{23} = 4$
3)
$\frac{12 \times 14}{13 \times 17} \times \frac{17 \times 13}{14 \times 24} = \frac{12}{24} = 2$
4)
$\frac{48 \times 5 + 48 \times 12}{17} = \frac{48 \times (5 + 12)}{17} = \frac{48 \times 17}{17} = 48$
5)
$\frac{11 \times 11 + 11 \times 2}{13 \times 15} = \frac{11 \times (11 \times 2)}{13 \times 15} = \frac{11 \times 13}{13 \times 15} = \frac{11}{15}$