б) 3a(a-1) + 2(a-13a^2 - 3a + 2a - 3a^2 - a - 2
в) 5m(n-3) - 7(3-n5mn - 15m - 21 + 75mn + 7n - 15m - 2n(5m + 7) - 3(5m + 7(n-3)(5m + 7)
г) a² + a - 3a - a^2 - 2a - (a-3)(a+1)
б) 3a(a-1) + 2(a-1
3a^2 - 3a + 2a -
3a^2 - a - 2
в) 5m(n-3) - 7(3-n
5mn - 15m - 21 + 7
5mn + 7n - 15m - 2
n(5m + 7) - 3(5m + 7
(n-3)(5m + 7)
г) a² + a - 3a -
a^2 - 2a -
(a-3)(a+1)