问题
填空题
(log43+log83)(log32+log98)=______.
答案
原式=(
+lg3 lg4
)(lg3 lg8
+lg2 lg3
)lg8 lg9
=(
+lg3 2lg2
)(lg3 3lg2
+lg2 lg3
)=3lg2 2lg3
?5lg3 6lg2
=5lg2 2lg3
.25 12
故答案为 25 12
(log43+log83)(log32+log98)=______.
原式=(
+lg3 lg4
)(lg3 lg8
+lg2 lg3
)lg8 lg9
=(
+lg3 2lg2
)(lg3 3lg2
+lg2 lg3
)=3lg2 2lg3
?5lg3 6lg2
=5lg2 2lg3
.25 12
故答案为 25 12