1/log以5为底7+1/log以3为底7+1/log以2为底7 求值
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1/log以5为底7+1/log以3为底7+1/log以2为底7求值1/log以5为底7+1/log以3为底7+1/log以2为底7求值1/log以5为底7+1/log以3为底7+1/log以2为底7
1/log以5为底7+1/log以3为底7+1/log以2为底7 求值
1/log以5为底7+1/log以3为底7+1/log以2为底7 求值
1/log以5为底7+1/log以3为底7+1/log以2为底7 求值
原式=log7(5)+log7(3)+log7(2)=log7(5*3*2)=log7(30)
1/log以5为底7+1/log以3为底7+1/log以2为底7
=lg5/lg7+lg3/lg7+lg2/lg7
=(lg5+lg3+lg2)/lg7
=(1+lg3)/lg7
=(1+0.4771)/0.8451
=1.7478
=log7 5+log7 3+log7 2
=log7(5*3*2)
=log7 30
1/log以5为底7+1/log以3为底7+1/log以2为底7 求值
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