问题
填空题
(log52+log252)(log25+log85)=______.
答案
(log52+log252)(log25+log85)
=(
+lg2 lg5
)(lg2 2lg5
+lg5 lg2
)lg5 3lg2
=
×3lg2 2lg5
=2.4lg5 3lg2
故答案为2.
(log52+log252)(log25+log85)=______.
(log52+log252)(log25+log85)
=(
+lg2 lg5
)(lg2 2lg5
+lg5 lg2
)lg5 3lg2
=
×3lg2 2lg5
=2.4lg5 3lg2
故答案为2.