Question

(-m)^5×(-m)^4等于？

Answer 1

(-m)^5×(-m)^4
=(-m)^9（同底数的幂相乘，底数不变，指数相加）
=-m^9。

Answer 2

(-m)^5×(-m)^4
=(-m^5)×(m^4)
=-m^(5+4)
=-m^9