log5(35)-2log5(7/3)+log5(7)-log5(1.8)

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log5(35)-2log5(7/3)+log5(7)-log5(1.8)
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log5(35)-2log5(7/3)+log5(7)-log5(1.8)
log5(35)-2log5(7/3)+log5(7)-log5(1.8)

log5(35)-2log5(7/3)+log5(7)-log5(1.8)
答:
换底公式应用等
log5(35)-2log5(7/3)+log5(7)-log5(1.8)
=log5(5)+log5(7)-2log5(7)+2log5(3)+log5(7)-log5(9/5)
=1+log5(9)-log5(9)+log5(5)
=1+1
=2

log5(35除以(7/3的平方)再乘以7再除以1.8) 数值你自己算吧