10的x次幂为2 10^x=2 x=lg2
10的y次幂为9 10^y=9 y=lg9
100的2x减二分之一y次幂的值
=100^(2x-y/2)
=10^(4x-y)
=10^(4lg2-lg9)
=10^(lg16-lg9)
=10^[lg(16/9)]
=16/9
10的x次幂为2 10^x=2 x=lg2
10的y次幂为9 10^y=9 y=lg9
100的2x减二分之一y次幂的值
=100^(2x-y/2)
=10^(4x-y)
=10^(4lg2-lg9)
=10^(lg16-lg9)
=10^[lg(16/9)]
=16/9