2/3减(5/6减3/4)加5/12计算,

问题描述:

2/3减(5/6减3/4)加5/12计算,

2/3-(5/6-3/4)+5/12
=2/3-(10/12-9/12)+5/12
=2/3-1/12+5/12
=2/3+4/12(4/12=1/3)
=1