问题
填空题
设lg2=a,lg3=b,那么lg
|
答案
lg
=1.8
lg1.8=1 2
lg1 2
=18 10
lg1 2 2×9 10
=
(lg 2+lg 9-1)1 2
=
(lg2+2lg3-1)1 2
=
(a+2b-1).1 2
故答案为
.a+2b-1 2
设lg2=a,lg3=b,那么lg
|
lg
=1.8
lg1.8=1 2
lg1 2
=18 10
lg1 2 2×9 10
=
(lg 2+lg 9-1)1 2
=
(lg2+2lg3-1)1 2
=
(a+2b-1).1 2
故答案为
.a+2b-1 2