(7/8+7/9+7/10+7/11)*(7/9+7/10+7/11+7/12)-(7/8+7/9+7/10+7/11+7/12)*(7/9+7/10+7/11)求帮助,谢谢!
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/22 00:06:28
![(7/8+7/9+7/10+7/11)*(7/9+7/10+7/11+7/12)-(7/8+7/9+7/10+7/11+7/12)*(7/9+7/10+7/11)求帮助,谢谢!](/uploads/image/z/765070-70-0.jpg?t=%287%2F8%2B7%2F9%2B7%2F10%2B7%2F11%29%2A%287%2F9%2B7%2F10%2B7%2F11%2B7%2F12%29-%287%2F8%2B7%2F9%2B7%2F10%2B7%2F11%2B7%2F12%29%2A%287%2F9%2B7%2F10%2B7%2F11%EF%BC%89%E6%B1%82%E5%B8%AE%E5%8A%A9%2C%E8%B0%A2%E8%B0%A2%21)
(7/8+7/9+7/10+7/11)*(7/9+7/10+7/11+7/12)-(7/8+7/9+7/10+7/11+7/12)*(7/9+7/10+7/11)求帮助,谢谢!
(7/8+7/9+7/10+7/11)*(7/9+7/10+7/11+7/12)-(7/8+7/9+7/10+7/11+7/12)*(7/9+7/10+7/11)求帮助,谢谢!
(7/8+7/9+7/10+7/11)*(7/9+7/10+7/11+7/12)-(7/8+7/9+7/10+7/11+7/12)*(7/9+7/10+7/11)求帮助,谢谢!
(7/8+7/9+7/10+7/11)*(7/9+7/10+7/11+7/12)-(7/8+7/9+7/10+7/11+7/12)*(7/9+7/10+7/11)
=(7/8+7/9+7/10+7/11)×(7/9+7/10+7/11+7/12)-(7/8+7/9+7/10+7/11)×(7/9+7/10+7/11)-7/12×(7/9+7/10+7/11)
=(7/8+7/9+7/10+7/11)×【(7/9+7/10+7/11+7/12)-(7/9+7/10+7/11)】-7/12×(7/9+7/10+7/11)
=(7/8+7/9+7/10+7/11)×【7/9+7/10+7/11+7/12-7/9-7/10-7/11】-7/12×(7/9+7/10+7/11)
=(7/8+7/9+7/10+7/11)×7/12-7/12×(7/9+7/10+7/11)
=(7/8+7/9+7/10+7/11-7/9-7/10-7/11)×7/12
=7/8×7/12
=49/96
=(7/8+7/9+7/10+7/11)*7/12-(7/9+7/10+7/11)
=7/8*7/12+(1-7/12)*(7/9+7/10+7/11)
=....接下来懒得写了。。