7/5+6/5+7/2+6/1 = = 7/5+6/5+7/2+6/1 = = 简便计算.

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7/5+6/5+7/2+6/1 = = 7/5+6/5+7/2+6/1 = = 简便计算.
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7/5+6/5+7/2+6/1 = = 7/5+6/5+7/2+6/1 = = 简便计算.
7/5+6/5+7/2+6/1 = = 7/5+6/5+7/2+6/1 = = 简便计算.

7/5+6/5+7/2+6/1 = = 7/5+6/5+7/2+6/1 = = 简便计算.
=（.式子）╱1
=5╱7＋5╱6＋2╱7＋1╱6
=5╱7＋2╱7＋5╱6＋1╱6
=1＋1
=2