Question

3的x次方=10,3的y次方=5,求2x-2y和3的3的x次方+2的y次方的值

Answer 1

x=log3 10

y=log3 5

2x-2y=2（log3 10-log3 5）=2log3 2

3^（3^x）+2^y

=3^10+2^（log3 5）