Question

已知2的X次方=a 2的y次方=b求2的X+Y次方和2的2X+2Y次方

Answer 1

由2^x=a

2^y=b

则:2^(x+y)

=2^x*2^y

=a*b

=ab

2^(2x+2y)

=2^2x*2^2y

=(2^x)^2 * (2^y)^2

=a^2*b^2

=a^2b^2