1.(a^2+3)(a-2)-a(a^2-2a-2)=? 2.(3/5a^5b^3+9/5a^7b^4-9/2a^5b^5)除以3/4a^5b^3)=?

1.(a^2+3)(a-2)-a(a^2-2a-2)=?
2.(3/5a^5b^3+9/5a^7b^4-9/2a^5b^5)除以3/4a^5b^3)=?
需要详细过程,谢谢!谢谢!谢谢!
(乱歼核a^2+3)(a-2)-a(a^2-2a-2)
=a^3-2a^2+3a-2-a^2+2a^2+2a
=5a-2

(3/改派5a^5b^3+9/5a^7b^4-9/2a^5b^5)除以哗掘3/4a^5b^3)
=4/5+12/5a^2b-6b^2
(a^2+3)(a-2)-a(a^2-2a-2)=? 2.(3/5a^