Question

已知X的a次方=3 X的b次方=5,则X的3a+2b次方的值为?

Answer 1

因为x^a=3,x^b=5,

所以x^(3a+2b)

=(x^3a)*(x^2b)

=(x^a)^3*(x^b)^2

=(3^3)*(5^2)

=27*25

=675