问题
解答题
计算(log43+log83)(log32+log92)的值.
答案
(log43+log83)(log32+log92)
=(
+lg3 lg4
)(lg3 lg8
+lg2 lg3
)lg2 lg9
=(
+lg3 2lg2
)(lg3 3lg2
+lg2 lg3
)lg2 2lg3
=
+1 2
+1 4
+1 3
=1 6
.5 4
计算(log43+log83)(log32+log92)的值.
(log43+log83)(log32+log92)
=(
+lg3 lg4
)(lg3 lg8
+lg2 lg3
)lg2 lg9
=(
+lg3 2lg2
)(lg3 3lg2
+lg2 lg3
)lg2 2lg3
=
+1 2
+1 4
+1 3
=1 6
.5 4