Toán Bài 3: tính nhanh `1/(1.2)+1/(2.3)+….+1/(99.100)` NHanh 14/09/2021 By Harper Bài 3: tính nhanh `1/(1.2)+1/(2.3)+….+1/(99.100)` NHanh
`1/1.2 + 1/2.3 +…+ 1/99.100` `= 1/1 – 1/2 + 1/2 – 1/3 + 1/3 – 1/4 +…+ 1/99 – 1/100` `= 1 – 1/100` `= 100/100 – 1/100` `= 99/100` `\text{Xin hay nhất để lên hsg cấp huyện}` Trả lời
`1/1.2 + 1/2.3 +…+ 1/99.100` `= 1 – 1/2 + 1/2 – 1/3 + 1/3 – 1/4+…+ 1/99-1/100` `= 1 – (1/2 – 1/2) – (1/3 – 1/3) -…- (1/99- 1/99) – 1/100` `= 1- 1/100` `= 99/100` Trả lời
`1/1.2 + 1/2.3 +…+ 1/99.100`
`= 1/1 – 1/2 + 1/2 – 1/3 + 1/3 – 1/4 +…+ 1/99 – 1/100`
`= 1 – 1/100`
`= 100/100 – 1/100`
`= 99/100`
`\text{Xin hay nhất để lên hsg cấp huyện}`
`1/1.2 + 1/2.3 +…+ 1/99.100`
`= 1 – 1/2 + 1/2 – 1/3 + 1/3 – 1/4+…+ 1/99-1/100`
`= 1 – (1/2 – 1/2) – (1/3 – 1/3) -…- (1/99- 1/99) – 1/100`
`= 1- 1/100`
`= 99/100`