15/16÷5/7÷3/4
=15/16x7/5x4/3
=7/4
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4/7÷8/3+3/7?3/8 =4/7x3/8+3/7x3/8 =(4/7+3/7)x3/8 =1x3/8 =3/8 5/8÷7/9+3/8÷7/9 =(5/8+3/8)÷7/9 =1÷7/9 =9/7 5/6?7/13+6/13÷6/5+5/6 =5/6x7/13+7/13x5/6+5/6 =5/6x(7/13+6/13+1) =5/6x2 =5/3
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