Question

24mn-3n+40n-5 m= -2 2/3 n=0.2

Answer 1

$24mn - 3n + 40n - 5m = \\ = 24mn + 37n - 5m = \\ = n(24m + 37) - 5m$
При m = -8/3, n=0.2:
$0.2( \frac{24 \times 8}{3} + 37) - \frac{5 \times 8}{3} = \\ = 0.2(64 + 37) - \frac{40}{3} = \\ = (0.2 \times 101) - \frac{40}{3} = \\ = 20.2 - \frac{40}{3} = \frac{101}{5} - \frac{40}{3} = \\ = \frac{103}{15}$