13/26×7/12+5/26×13/12怎么简便运算?

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13/26×7/12+5/26×13/12怎么简便运算?
13/26×7/12+5/26×13/12怎么简便运算?

13/26×7/12+5/26×13/12怎么简便运算?
13/26×7/12+5/26×13/12
=13/26×7/12+13/26×5/12
=13/26×（7/12+5/12）
=13/26x1
=13/26