1/(log3 根号15)+1/(log5 根号15)等于多少
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1/(log3 根号15)+1/(log5 根号15)等于多少
1/(log3 √15)+1/(log5 √15)
=1/(1/2*log3 15)+1/(1/2*log5 15)
=2/(log3 15)+2/(log5 15)
=2/[log3 (3*5)]+2/[log5 (3*5)]
=2/[log3 3 +log3 *5]+2/[log5 3 +log5 5]
=2/[1+log3 *5]+2/[1+log5 3]
=2/[1+log3 *5]+2/[1+1/log3 5]
=2/[1+log3 *5]+2log3 5/[1+log3 5]
=[2+2log3 5]/[1+log3 5]
=2[1+log3 5]/[1+log3 5]
=2
再问: =2/(log3 15)+2/(log5 15) ????
再答: 1/(1/2) =1*2 =2
=1/(1/2*log3 15)+1/(1/2*log5 15)
=2/(log3 15)+2/(log5 15)
=2/[log3 (3*5)]+2/[log5 (3*5)]
=2/[log3 3 +log3 *5]+2/[log5 3 +log5 5]
=2/[1+log3 *5]+2/[1+log5 3]
=2/[1+log3 *5]+2/[1+1/log3 5]
=2/[1+log3 *5]+2log3 5/[1+log3 5]
=[2+2log3 5]/[1+log3 5]
=2[1+log3 5]/[1+log3 5]
=2
再问: =2/(log3 15)+2/(log5 15) ????
再答: 1/(1/2) =1*2 =2
log5[log根号2-1(1/根号(3+2根号2))] 等于多少?
计算log2 6-log2 3,lg5+lg2,log5 3+log5 1/3,log3 5-log3 15
为什么1/log5(3)等于log3(5) ?
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高中对数log2(9)*log3(根号5)*log5(2)
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