1/6+1/12+1/20+1/30+……..1/90 1/6:1 phần 6 thanks 29/08/2021 Bởi Kylie 1/6+1/12+1/20+1/30+……..1/90 1/6:1 phần 6 thanks
Đáp án: `=2/5` `———————–` `=1` Giải thích các bước giải: `1/6+1/12+1/20+1/30+…+1/90` `=1/2.3+1/3.4+1/4.5+1/5.6+…+1/9.10` `=1/2-1/3+1/3-1/4+1/4-1/5+…+1/9-1/10` `=1/2-1/10=5/10-1/10=4/10=2/5` `———————–` `1/6:1/6` `=1` Bình luận
`1/6 + 1/12 + 1/20 + 1/30 +…+1/90` `1/2.3+ 1/3.4 + 1/4.5 + 1/5.6+…+1/9.10` `= 1/2 – 1/3 + 1/3 -1/4+…+1/9 -1/10` `=1/2 – 1/10` `= 2/5` Bình luận
Đáp án:
`=2/5`
`———————–`
`=1`
Giải thích các bước giải:
`1/6+1/12+1/20+1/30+…+1/90`
`=1/2.3+1/3.4+1/4.5+1/5.6+…+1/9.10`
`=1/2-1/3+1/3-1/4+1/4-1/5+…+1/9-1/10`
`=1/2-1/10=5/10-1/10=4/10=2/5`
`———————–`
`1/6:1/6`
`=1`
`1/6 + 1/12 + 1/20 + 1/30 +…+1/90`
`1/2.3+ 1/3.4 + 1/4.5 + 1/5.6+…+1/9.10`
`= 1/2 – 1/3 + 1/3 -1/4+…+1/9 -1/10`
`=1/2 – 1/10`
`= 2/5`