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计算:lg14%2lg73+lg7%lg18=______

lg14-2lg73+lg7-lg18=lg14-lg49+lg9+lg7-lg18=lg(14×9...

(1)∵lg14-2lg73+lg7-lg18=(lg7+lg2)-2(lg7-lg3)+lg7-(...

lg14-2lg7/3+lg7-lg18 =(lg2+lg7)-2(lg7-lg3)+lg7-(l...

(1)lg243lg9=log9243=log3235=52(2)lg14-2lg73+lg7-lg...

lg14-2lg(7/3)+lg7-lg18 =(lg2+lg7)-2(lg7-lg3)+lg7-(...

解: lg18=lg(2x9) =lg2+lg9 ...

(1)∵lg14- 2lg 7 3 +lg7-lg18=(lg7+lg2)-2(...

lg18=1.2552725051033060698037947012347

∵lg2=m,lg3=n,∴lg18=lg2+2lg3=m+2n.故答案为:m+2n.

lg108=lg(27*4)=lg27+lg4=3lg3+2lg2=3b+2a lg18/25 ...

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