Tính B=5/1.2+5/2.3+5/3.4+5/4.5+…+5/149.150 17/09/2021 Bởi Claire Tính B=5/1.2+5/2.3+5/3.4+5/4.5+…+5/149.150
`B=5/1.2+5/2.3+5/3.4+5/4.5+…+5/149.150` `B= 5.(1/1 – 1/2 + 1/2-1/3+1/3-1/4+…+1/149-1/150)` `B= 5. ( 1- 5/150)` ` B = 5 .149/150` `B = 149/30` Bình luận
Đáp án: Giải thích các bước giải: ` B=5/1.2+5/2.3+5/3.4+5/4.5+…+5/149.150` `B=5.(1/1.2+1/2.3+1/3.4+1/4.5+…+1/149.150)` `B=5.(1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+…+1/149-1/150)` `B=5.(1-1/150)` `B=5. 149/150` `B=149/30` Bình luận
`B=5/1.2+5/2.3+5/3.4+5/4.5+…+5/149.150`
`B= 5.(1/1 – 1/2 + 1/2-1/3+1/3-1/4+…+1/149-1/150)`
`B= 5. ( 1- 5/150)`
` B = 5 .149/150`
`B = 149/30`
Đáp án:
Giải thích các bước giải:
` B=5/1.2+5/2.3+5/3.4+5/4.5+…+5/149.150`
`B=5.(1/1.2+1/2.3+1/3.4+1/4.5+…+1/149.150)`
`B=5.(1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+…+1/149-1/150)`
`B=5.(1-1/150)`
`B=5. 149/150`
`B=149/30`