等于11/12-5/12-1/6=6/12-1/6=1/2-1/3=3/6-2/6=1/6所以结果等于1/6
简便方法11/12-(1/6+5/12)=11/12-(2/12+5/12)=11/12-7/12=4/12=1/3
11/12-(1/6+5/12)
=11/12-1/6-5/12..................【去括号】
=11/12-5/12-1/6....................【交换律】
=1/2-1/6
=1/3