1、第一步，首先观察一下表达式，7/13+7/13×25，前面和后面有共同项7/13
7/13 + 7/13 x 25
= 7/13 x 1 + 7/13 x 25
2、第二步，提取同类项7/13
7/13 + 7/13 x 25
= 7/13 x 1 + 7/13 x 25
= 7/13 x (1 + 25)
3、第三步，计算两个数的和
7/13 + 7/13 x 25
= 7/13 x 1 + 7/13 x 25
= 7/13 x (1 + 25)
= 7/13 x 26
4、第四步，由于13和26有公共的约数13，可以将分母简化
7/13 + 7/13 x 25
= 7/13 x 1 + 7/13 x 25
= 7/13 x (1 + 25)
= 7/13 x 26
= 7 x 2
5、第五步，计算两个数的乘积
7/13 + 7/13 x 25
= 7/13 x 1 + 7/13 x 25
= 7/13 x (1 + 25)
= 7/13 x 26
= 7 x 2
= 14
6、总结：
A + A x B
= A x 1 + A x B
= A x (1 + B)
= A x C
= D
