9/15×15/17+8/17×14/15简算
问题描述：
9/15×15/17+8/17×14/15简算
求脱式计算的简算过程,切勿看错题
也就是
9 15 8 14
— × — + — × —
15 17 17 15
答
9/15×15/17+8/17×14/15
=9/17+8/17x14/15
=1-8/17+8/17x14/15
=1-8/17x1/15
=1-8/255
=247/255