log5(35)+log0.5(2)-(-log3(27))-(-log3(15))-log5(21)
=log5(35/21)-log2(2)+log3(15*27)
=log5(5/3)-1+log3(3^4*5)
=log5(5)-log5(3)-1+4+log3(5)
=log3(5)-log5(3)
=ln5/ln3-ln3/ln5+4
我不记得让被那些自然对数值了,不完整自己加一下吧
求 log5（35）+ 2log0.5（根号2）-log3（1/27）-log3（1/15）-log5（21）
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