`B=1/3+1/6+1/60+1/15+…+1/2021` Giúp mk với,mk cần gấp: 10/09/2021 Bởi Rose `B=1/3+1/6+1/60+1/15+…+1/2021` Giúp mk với,mk cần gấp:
Đáp án: ` =>(1/2).B=1/2.(1/3+1/6+1/10+……….+1/2016)` `(1/2).B=1/6+1/12+1/20+…….+1/4042` `(1/2).B=1/(2.3)+1/(3.4)+………+1/(63.64)` `(1/2).B=1/2-1/3+1/3-1/4+…………+1/64-1/64` `(1/2).B=1/2-1/64=32/64-1/64` `(1/2).B=31/64` `B =(31/64).2` `B=31/32` XIN HAY NHẤT NHA Bình luận
Đáp án: `B=31/32` Giải thích các bước giải: đề sai : `B=1/3+1/6+1/60+1/15+…+1/2021` sửa lại : `B=1/3+1/6+1/10+1/15+…+1/2016` bài làm : `B=1/3+1/6+1/10+1/15+…+1/2016` `B=2/6+2/12+2/20+2/30+…+2/4032` `B=2/2.3+2/3.4+2/4.5+2/5.6+…+2/63.64` `B=2[1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+…+1/63-1/64]` `B=2[1/2-(1/3-1/3+1/4-1/4+1/5-1/5+1/6-…-1/63+1/64)]` `B=2[1/2-1/64]` `B=2*31/64` `B=31/32` Bình luận
Đáp án:
` =>(1/2).B=1/2.(1/3+1/6+1/10+……….+1/2016)`
`(1/2).B=1/6+1/12+1/20+…….+1/4042`
`(1/2).B=1/(2.3)+1/(3.4)+………+1/(63.64)`
`(1/2).B=1/2-1/3+1/3-1/4+…………+1/64-1/64`
`(1/2).B=1/2-1/64=32/64-1/64`
`(1/2).B=31/64`
`B =(31/64).2`
`B=31/32`
XIN HAY NHẤT NHA
Đáp án:
`B=31/32`
Giải thích các bước giải:
đề sai :
`B=1/3+1/6+1/60+1/15+…+1/2021`
sửa lại :
`B=1/3+1/6+1/10+1/15+…+1/2016`
bài làm :
`B=1/3+1/6+1/10+1/15+…+1/2016`
`B=2/6+2/12+2/20+2/30+…+2/4032`
`B=2/2.3+2/3.4+2/4.5+2/5.6+…+2/63.64`
`B=2[1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+…+1/63-1/64]`
`B=2[1/2-(1/3-1/3+1/4-1/4+1/5-1/5+1/6-…-1/63+1/64)]`
`B=2[1/2-1/64]`
`B=2*31/64`
`B=31/32`