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设abc均为实数,且3的a次方=6的b次方=4,则1/a-1/b=?
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设abc均为实数,且3的a次方=6的b次方=4,则1/a-1/b=?
▼优质解答
答案和解析
3^a=6^b=4
a=log3(4) 1/a=log4(3)
b=log6(4) 1/b=log4(6)
1/a-1/b=log4(3)-log4(6)
=log4(3/6)
=log4(1/2)
=-1/2
a=log3(4) 1/a=log4(3)
b=log6(4) 1/b=log4(6)
1/a-1/b=log4(3)-log4(6)
=log4(3/6)
=log4(1/2)
=-1/2
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