Tính tổng B = 1/3×4 + 1/4×5 + 1/ 5×6 + …….. + 1/95×96 24/09/2021 Bởi Madeline Tính tổng B = 1/3×4 + 1/4×5 + 1/ 5×6 + …….. + 1/95×96
B = 1/3×4 + 1/4×5 + 1/ 5×6 + …….. + 1/95×96 B = 1/3 – 1/4 + 1/4 – 1/5 + 1/5 – 1/6 + … + 1/95 – 1/96 B = 1/3 – 1/96 B = 31/96 Bình luận
`B=1/3.4+1/4.5+1/5.6+…+1/95.96` `⇒B=1/3-1/4+1/4-1/5+1/5-1/6+…+1/95-1/96` `⇒B=1/3-1/96` `⇒B=32/96-1/96` `⇒B=31/96` Bình luận
B = 1/3×4 + 1/4×5 + 1/ 5×6 + …….. + 1/95×96
B = 1/3 – 1/4 + 1/4 – 1/5 + 1/5 – 1/6 + … + 1/95 – 1/96
B = 1/3 – 1/96
B = 31/96
`B=1/3.4+1/4.5+1/5.6+…+1/95.96`
`⇒B=1/3-1/4+1/4-1/5+1/5-1/6+…+1/95-1/96`
`⇒B=1/3-1/96`
`⇒B=32/96-1/96`
`⇒B=31/96`