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.

=(.式子)╱1
=5╱7+5╱6+2╱7+1╱6
=5╱7+2╱7+5╱6+1╱6
=1+1
=2