谢谢`我有急用`` 76*(1/23-1/53)+23*(1/53+1/76)-53*(1/23-1/76)

=76*(1/23-1/53)+23*(1/53+1/76)+53*(-1/23-1/53+1/53+1/76)
=76*(1/23-1/53)+[23*(1/53+1/76)+53*(1/53+1/76)]-53*(1/23+1/53)
=76*(1/23-1/53)+76*(1/53+1/76)-53*(1/23+1/53)
=76*(1/23+1/76)-53*(1/23+1/53)
=76/23+1-53/23-1
=1