Tính tổng: C=1-1/10-1/15-1/3-1/28-1/6-1/21 07/07/2021 Bởi Bella Tính tổng: C=1-1/10-1/15-1/3-1/28-1/6-1/21
Đáp án: `1/2.C=1/2(1-1/10-1/15-1/3-1/28-1/6-1/21)` `1/2.C=1/2-(1/6+1/12+1/20+1/30+1/42+1/56)` `=1/2-(1/2.3+1/3.4+1/4.5+1/5.6+1/6.7+1/7.8)` `=1/2-(1/2-1/8) ` `=1/8` `=> C =1/8 : 1/2 = 1/4` Vậy `C = 1/4` Bình luận
Đáp án: tham khảo nha bn: ta có :1/2 P=1/2(1-1/10-1/15-1/3-1/28-1/6-1/21) =1/2-(1/6+1/12+1/20+1/30+1/42+1/56) =1/2-(1/2.3+1/3.4+1/4.5+1/5.6+1/6.7+1/7.8) =1/2-(1/2-1/8) =1/8suy ra P=1/4 @chijsv34 Bình luận
Đáp án:
`1/2.C=1/2(1-1/10-1/15-1/3-1/28-1/6-1/21)`
`1/2.C=1/2-(1/6+1/12+1/20+1/30+1/42+1/56)`
`=1/2-(1/2.3+1/3.4+1/4.5+1/5.6+1/6.7+1/7.8)`
`=1/2-(1/2-1/8) `
`=1/8`
`=> C =1/8 : 1/2 = 1/4`
Vậy `C = 1/4`
Đáp án:
tham khảo nha bn:
ta có :1/2 P=1/2(1-1/10-1/15-1/3-1/28-1/6-1/21)
=1/2-(1/6+1/12+1/20+1/30+1/42+1/56)
=1/2-(1/2.3+1/3.4+1/4.5+1/5.6+1/6.7+1/7.8)
=1/2-(1/2-1/8)
=1/8suy ra P=1/4
@chijsv34