﹙5/18÷1/3+5/18﹚×0.25
=(5/6+5/18)*1/4=20/18*1/4=5/18
﹙6+3/5﹚×5/6
=6*5/6+3/5*5/6=5又1/2
11/16+8/13-(11/16-5/13)
=11/16+8/13-11/16+5/13=1
(1/16+1/2-9/16)÷8/21
=0
3/7×(4/5-2/3)÷3/15
=3/7*2/15*/(1/5)=2/7
(1/2+1/3)÷3/5-17/18
=5/6*5/3-17/18=4/9
8/15×[3/4÷﹙7/16-1/4﹚]
=8/15*3/4/(3/16)=32/15
2/3×[1÷﹙5/6-4/6﹚]
=2/3*1/(1/6)=4
7/8÷[﹙1/2+3/5﹚×5/11]
=7/8/(11/10*5/11)=7/8/(1/2)=7/4
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