11/12+3又1/7+3又1/12+(5又6/7-0.123),怎么算,

11/12+3又1/7+3又1/12+(5又6/7-0.123),怎么算,
11/12+3又1/7+3又1/12+(5又6/7-0.123),怎么算,

11/12+3又1/7+3又1/12+(5又6/7-0.123),怎么算,
11/12+3又1/7+3又1/12+(5又6/7-0.123)
=（3又1/7+5又6/7）+(11/12+3又1/12)-0.123
=9+4-0.123
=13-0.123
=12.877
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