2^[1-log(4)5]+log(√2)4+log(3)1/9
=2^[1-log(4)5]+log(√2)(√2)^4+log(3)3^(-2)
=2^[1-log(4)5]+4-2
=2^log(4) 4/5 +2
这里需要换底计算了
=2^[log(2) 4/5] / [log(2) 4]+2
=2/5 +2
=12/5