log2?-lg3×log3?-lg5求解答.急啊

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log2?-lg3×log3?-lg5求解答.急啊

log2?-lg3×log3?-lg5求解答.急啊
log2?-lg3×log3?-lg5求解答.急啊

log2?-lg3×log3?-lg5求解答.急啊
log₂1-lg3×log₃2-lg5
原式=0-(lg3×log₃2+lg5)
=0-﹙㏒₃3/㏒₃10 ×log₃2 + ㏒₃5/㏒₃10﹚
=0-[1/㏒₃10 (㏒₃2 +㏒₃5)]
=0-(1/㏒₃10 × ㏒₃10)
=0-1
=-1