Verified answer

Ответ:

Объяснение:

1) (3х - 5m) * ( 3m - 2x) + (2x - m)* (3x - 15m) =

= 9xm - 6x^2 - 15m^2 + 10xm + 6x^2 - 30xm -3xm + 15m^2 = - 14xm

2) (3b^2 + 4) * ( 2b^3 - x) - 3b^3*(5 + 2b^2) =

= 6b^5 - 3xb^2 + 8b^3 - 4x - 15b^3 - 6b^5 = -3xb^2 - 4x - 7b^3

3) (2m - 1)^2 + (3m - 4) * ( 4 + 3m) = (2m - 1) * (2m - 1) + (3m - 4) * ( 4 + 3m) =

= 4m^2 - 2m  - 2m + 1 + 12m + 9m^2 - 16 - 12m = 13m^2 - 4m - 15