简算:(1+19/105)+(1+19/105*2)+(1+19/105*3)+.+(1+19/105*19)+(1+19/105*20)(1+19/105)+(1+19/105*2)+(1+19/105*3)+...+(1+19/105*20)简算
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/06 15:44:12
![简算:(1+19/105)+(1+19/105*2)+(1+19/105*3)+.+(1+19/105*19)+(1+19/105*20)(1+19/105)+(1+19/105*2)+(1+19/105*3)+...+(1+19/105*20)简算](/uploads/image/z/16717-13-7.jpg?t=%E7%AE%80%E7%AE%97%EF%BC%9A%EF%BC%881%2B19%2F105%EF%BC%89%2B%EF%BC%881%2B19%2F105%2A2%EF%BC%89%2B%EF%BC%881%2B19%2F105%2A3%EF%BC%89%2B.%2B%EF%BC%881%2B19%2F105%2A19%EF%BC%89%2B%EF%BC%881%2B19%2F105%2A20%EF%BC%89%EF%BC%881%2B19%2F105%EF%BC%89%2B%EF%BC%881%2B19%2F105%2A2%EF%BC%89%2B%EF%BC%881%2B19%2F105%2A3%EF%BC%89%2B...%2B%EF%BC%881%2B19%2F105%2A20%EF%BC%89%E7%AE%80%E7%AE%97)
简算:(1+19/105)+(1+19/105*2)+(1+19/105*3)+.+(1+19/105*19)+(1+19/105*20)(1+19/105)+(1+19/105*2)+(1+19/105*3)+...+(1+19/105*20)简算
简算:(1+19/105)+(1+19/105*2)+(1+19/105*3)+.+(1+19/105*19)+(1+19/105*20)
(1+19/105)+(1+19/105*2)+(1+19/105*3)+...+(1+19/105*20)简算
简算:(1+19/105)+(1+19/105*2)+(1+19/105*3)+.+(1+19/105*19)+(1+19/105*20)(1+19/105)+(1+19/105*2)+(1+19/105*3)+...+(1+19/105*20)简算
(1+19/105)+(1+19/105*2)+(1+19/105*3)+.+(1+19/105*19)+(1+19/105*20)
=1+1+.+1 (20个1)
+(19/105)+(19/105*2)+(119/105*3)+.+(19/105*19)+(19/105*20)
=20+ (19/105)×(1+2+.+20)
=20+(19/105)×(1+20)×20÷2
=20+38
=58