5/6+5/6+5/6*11
=5/6*(1+1+11)
=5/6*13
=65/16
（3/4-5/12）/（1/3+1/4）
=(9/12-5/12)/(4/12+3/12)
=4/12÷7/12
=4/12*12/7
=4/7
10.5*（3.8-0.8）/6.3
=10.5*3/6.3
=10.5*3/3*2.1
=10.5/2.1
=5
8/15÷[2/3*（17/18-8/9）]
=8/15÷[2/3*（17/18-16/18）]
=8/15÷[2/3*1/18]
=8/15÷1/27
=8/15*27
=72/5
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