Упростите выражение: (10a-6b+5c-4d)-(9a-2b-4c+2d) (5a^2-ax+x^2)+(3a^2+2ax-3x^2)-(4ax+2x^2+a^2 (2m^4+5m^2n^3-mn^3)+(3m^4-8m^3n^2-6mn^3
10а-6b+5 c-4 d-9a+2b+4c-2d=a-4b+9c-6d 5a^2-ax+x^2+3a^2+2ax-3x^2-4ax-2x^2-a^2=7a^2-3ax-4x^2 2m^4+5m^2n^3-mn^3+3m^4-8m^3n^2-6mn^3=5m^4-7mn^3+5m^2n^3-8m^3n^2