Ответ:

1. 38

2. 9 целых 12/27

Объяснение:

● 2а^2+ас-2ас^2-с^3=2×17^2+17×4-2×17×4^2-4^3=

= 2×289+68-34×16-64=578+68-544-64=38.

● m^3+m^2n-10m+n^3+n^2m-10n=

=(1/3)^3+(1/3)^2×2/3-10×1/3+(2/3)^3+(2/3)^2×1/3-10×2/3=

=1/27+1/9×2/3-10/3+8/27+4/9×1/3-20/3=

=1/27+2/27-10/3+8/27+4/27-20/3=

=15/27-30/3=15/27-10=15-270/27= -255/27=

= -9 целых 12/27.

Прости если ошибка