Question

已知8的x次方等于5,四的y次方等于七,求2的6x+4+y

Answer 1

8^x =5
2^(3x)=5
4^y=7
2^(2y)=7
2^(6x+4y)
=[2^(3x+2y)]^2
=[(5)(7)]^2
=35^2
=1225