问题
解答题
(1)loga2+loga
(2)lg20+log10025; (3)2
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答案
(1)loga2+loga
=loga2-loga2=01 2
(2)lg20+log10025=lg2+1+
=lg2+1+lg5=2lg25 2
(3)2
×3
×6 12
=2×33 3 2
×121 2
×(1 6
)3 2
=21+1 3
-2 6
×31 3
+1 2
+1 6
=2×3=61 3