不乖儿烨子,你好:16/11-7/12+3/11-5/12-1/11=(16/11+3/11-1/11)-(7/12+5/12)=18/11-1=7/11
16/11-7/12+3/11-5/12-1/11=16/11+3/11-1/11-7/12-5/12=(16+3-1)/11-(7+5)/12=18/11-1=7/11
16/11-7/12+3/11-5/12-1/11=(16+3-1)/11-(7+5)/12=18/11-1=7/11