50×51分之1+51×52×53分之1+53×54分之1+54乘55分之1
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/06 14:05:25
![50×51分之1+51×52×53分之1+53×54分之1+54乘55分之1](/uploads/image/z/66081-57-1.jpg?t=50%C3%9751%E5%88%86%E4%B9%8B1%2B51%C3%9752%C3%9753%E5%88%86%E4%B9%8B1%2B53%C3%9754%E5%88%86%E4%B9%8B1%2B54%E4%B9%9855%E5%88%86%E4%B9%8B1)
50×51分之1+51×52×53分之1+53×54分之1+54乘55分之1
50×51分之1+51×52×53分之1+53×54分之1+54乘55分之1
50×51分之1+51×52×53分之1+53×54分之1+54乘55分之1
1/(50×51)+1/(51×52)+1/(53×54)+1/(54×55)
=1/50-1/51+1/51-1/52+1/53-1/54+1/54-1/55
=1/50-1/55
=(55-50)/(50×55)
=5/(50*55)
=1/550