1/105÷[1/7一(-1/3)-1/5]

问题描述:

1/105÷[1/7一(-1/3)-1/5]

1/105÷[1/7一(-1/3)-1/5]
=1/105÷(1/7+1/3-1/5)
=1/105÷(1/7+1/15)
=1/105÷22/105
=1/22