㏒8^9×㏒3^2+lg5×lg20+（lg2)^2

来源：学生作业帮助网 编辑：作业帮 时间：2024/05/08 18:49:48

㏒8^9×㏒3^2+lg5×lg20+（lg2)^2
㏒8^9×㏒3^2+lg5×lg20+（lg2)^2

㏒8^9×㏒3^2+lg5×lg20+（lg2)^2
=lg9/lg8×lg3/lg2+(1-lg2)(1+lg2)+lg²2
=2/3+1
=5/3

那个log5好像消不掉，顺便问下㏒8^9这个是以8为底求9的对数么？还是说求以10为底8的9次方的对数？

㏒8^9×㏒3^2+lg5×lg20+（lg2)^2 lg5+㏒3^6+lg20-㏒3^2 lg5*lg5+2/3lg8+lg5*lg20求值, 2lg5+lg20=?lg5*lg20=? lg5^2+2/3lg8+lg5*lg20+(lg2)^2 lg5*lg20怎么办啊 lg4+lg5.lg20+(lg5)2 lg4+lg5.lg20+(lg5)2 (lg2)^2+lg5*lg20 (lg2)^2+lg20*lg5 lg5^2+2/3lg8+lg5*lg20+lg2^2 lg5^2+2/3lg8+lg5*lg20+lg^2 lg5^2+lg8^2/3+lg5*lg20+(lg2)^2=? （lg5)平方+2/3lg8+lg5乘lg20+（lg2)平方 lg5²+2/3lg8+lg5*lg20+(lg2)² lg5²+2/3lg8+lg5×lg20+(lg2)² lg5^2+lg4+lg5*lg20+(lg2)^2 (lg2)^2+lg20*lg5+(lg5)^2 lg5^2+lg4+lg5*lg20+(lg2)^@