Question

Упростите: 2,8( 4/7m - 0,5 n) - 4/9( 3,6m - 2 целых 1/4n)

Answer 1

2,8( 4/7m - 0,5n) - 4,9(3,6m - 2 целых 1/4n) = 2 целых 8/10 (4/7m - 5/10n) - 4/9( 3 целых 6/10m - 2 целых 1/4n) = (28/10 × 4/7m - 28/10 × 5/10n) - (4/9 × 36/10m - 4/9 × 9/4n) = 8/5m - 7/5n - 8/5m + n = - 0,4n

Answer 2

... = 145(47m - 12n) - 49(185m - 94n) = 85m - 75n - 85m - n =
-2 25n