[lg3+1]*lg5+lg2*lg3 接下来该怎么做,并说明原因
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[lg3+1]*lg5+lg2*lg3 接下来该怎么做,并说明原因
[lg3+1]*lg5+lg2*lg3 接下来该怎么做,并说明原因
[lg3+1]*lg5+lg2*lg3 接下来该怎么做,并说明原因
(lg3+1)*lg5+lg2*lg3
=lg3(lg5+lg2)+lg5
=lg(3*5)
=lg15