Question

12aⁿb²[b^n-1-2abⁿ⁺¹+（-1）^-1b^n-1]+24aⁿ⁺¹bⁿ⁺³．

Answer 1

原式=12aⁿb²（b^n-1-2abⁿ⁺¹-b^n-1）+24aⁿ⁺¹ b ⁿ⁺³
=12aⁿbⁿ⁺¹-24aⁿ⁺¹b ⁿ⁺³-12aⁿbⁿ⁺¹+24aⁿ⁺¹ b ⁿ⁺³
=12aⁿbⁿ⁺¹-12aⁿbⁿ⁺¹