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並前往https://www.studyrankersonline.com/3883/prove-that-log-2-2-log-5-log-3-2-log-7-log-50-147

Prove that: log 2 + 2 log 5 - log 3 - 2 log 7 = log 50/147.

LHS= log2+2log5-log3-2log7 = log2+log5²-log3-log7² = log2*5²-log3*7² (loga +logb=logab) = log50/147 (loga-logb=loga/b) = RHS HENCE, Proved!

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