问题描述：
13/11÷26= 5/8×5= 3/2÷2/3= 8/15×9/10= 5/8×4/15=
9/10÷12/5= 21×3/35= 45÷9/5×2/81=
9×5/6÷5/12= 30÷2/3÷4/5= 5/9×11/3×1/2= 3/7÷7/13×14/9= 4/7×28÷1/10=
9/10÷12/5= 21×3/35= 45÷9/5×2/81=
9×5/6÷5/12= 30÷2/3÷4/5= 5/9×11/3×1/2= 3/7÷7/13×14/9= 4/7×28÷1/10=
问题解答：
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