Question

1.5^m*125^m÷25^（2m-1）

Answer 1

1.

5^m*125^m÷25^(2m-1)

=5^m*5^(3m)÷5^(4m-2)

=5^(m+3m-4m+2)

=25

2.

5/8[(a+b)(a-b)]^4*4/9(a+b)^4(b-a)^5

=5/18[(a+b)(a-b)]^4*(a+b)^4(b-a)^5

=-5/18(a+b)^4(a-b)^4(a+b)^4(a-b)^5

=-5/18(a+b)^8(a-b)^8(a-b)

=-5/18(a^2-b^2)^8(a-b)