(log43+log83)(log32+log92)-log1/2乘以32的根号的4次方
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(log43+log83)(log32+log92)-log1/2乘以32的根号的4次方
(log4*3+log8*3)(log3*2+log9*2)-log1/2乘以32的根号的4次方
(log4*3+log8*3)(log3*2+log9*2)-log1/2乘以32的根号的4次方
用换底公式,原式
=(ln3/ln4+ln3/ln8)(ln2/ln3+ln2/ln9)-ln(32的根号的4次方)/ln(1/2)
=[ln3/(2*ln2)+ln3/(3*ln2)]*[ln2/ln3+ln2/(2*ln3)]-1/4[ln(2^5)]/(-ln2)
=(1/2+1/3)*ln3/ln2*(1+1/2)*ln2/ln3-5/4*ln2/(-ln2)
=5/6*3/2+5/4
=5/2
=(ln3/ln4+ln3/ln8)(ln2/ln3+ln2/ln9)-ln(32的根号的4次方)/ln(1/2)
=[ln3/(2*ln2)+ln3/(3*ln2)]*[ln2/ln3+ln2/(2*ln3)]-1/4[ln(2^5)]/(-ln2)
=(1/2+1/3)*ln3/ln2*(1+1/2)*ln2/ln3-5/4*ln2/(-ln2)
=5/6*3/2+5/4
=5/2
(log43+log83)(log32+log92)
(log43+log83)(log32+log92)=
(log32+log92)•(log43+log83)= ___ .
利用对数换底公式化简:(log43+log83)(log32+log92)
运用对数的换底公式化简log23×log34×log45×log52:;(log43+log83)(log32+log9
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