Question

计算：（1）a*(-ab^2)^3 (2)(-2m^2)^3*3n^4/(-3m^3n)^2 (3)a^5-8a^3+1

Answer 1

（1）a*(-ab^2)^3

=-a^4b^6

(2)(-2m^2)^3*3n^4/(-3m^3n)^2

=-24m^6n^4/9m^6n^2

=-8/3n^2

(3)a^5-8a^3+16a

=a(a^4-8a^2+16)

=a(a^2-4)^2

=a(a+2)^2(a-2)^2

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