Question

2的a次方=10,16的b次方=5,求4的a-4b次方+2的3a-8b次方

Answer 1

16^b=2^4b=5

原式=4^a÷4^4b+2^3a÷2^8b

=(2^a)^2÷(2^4b)^2+(2^a)^3÷(2^4b)^2

=100÷25+1000÷25

=4+40

=44