来自姜新法的问题
1又5/1-12/7+20/9-30/11+42/13-56/13
1又5/1-12/7+20/9-30/11+42/13-56/13
1回答
2020-03-02 20:29
1又5/1-12/7+20/9-30/11+42/13-56/13
1又5/1-12/7+20/9-30/11+42/13-56/13
如果是简便计算,题目应该是:
6/5-12/7+20/9-30/11+42/13-56/15
=(2/1+3/1)-(3/1+4/1)+(4/1+5/1)-(5/1+6/1)+(6/1+7/1)-(7/1+8/1)
=2/1-8/1
=8/3