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简便计算8/13÷7+1/7×6/13

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6/13÷7+1/7×8/13 =1/7(6/13+8/13) =1/7×14/13 =2/13

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8/13×1/7+1/7×6/13 1/7×(8/13+6/13) 1/7×14/13 2/13

8/13÷7+1/7x6/13 =8/13x1/7+1/7x6/13 =(8/13+6/13)x1/

(1/15+1/21)×105 =(1/15)*(15*7)+(1/21)*(21*5) =7

原式=9/13*(1/7+6/7)=9/13

(13分之7+13分之6)乘9分之1

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