简便计算7/13 * 14/9 + 7/9 * 12/13下面禁止骂人、打酱油、刷、黄
简便计算7/13 * 14/9 + 7/9 * 12/13下面禁止骂人、打酱油、刷、黄
简便计算7/13 * 14/9 + 7/9 * 12/13
下面禁止骂人、打酱油、刷、黄
简便计算7/13 * 14/9 + 7/9 * 12/13下面禁止骂人、打酱油、刷、黄
7/13 * 14/9 + 7/9 * 12/13
=7/13 * 14/9 +12/9 * 7/13
=7/13 * (14/9 +12/9 )
=7/13 * 26/9
=14/9
把14/9看成7/9*2 之后加法结合律
7/13 * 14/9 + 7/9 * 12/13
=7/13 * 14/9 +12/9 * 7/13
=7/13 * (14/9 +12/9 )
=7/13 * 26/9
=14/9希望对你有帮助。