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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 7: B=`1/3.4`-`1/4.5`-`1/5.6`-`1/6.7`-`1/7.8`-`1/8.9`-`1/9.10`

Tháng Sáu 28, 2022 Toán học 1 Comment 0 views

Toán Lớp 7: B=1/3.4-1/4.5-1/5.6-1/6.7-1/7.8-1/8.9-1/9.10

Comments ( 1 )

  1. buithaianh98
    buithaianh98
    28 Tháng Sáu, 2022 at 4:37 sáng
    Reply
    B=1/(3.4)-1/(4.5)-1/(5.6)-1/(6.7)-1/(7.8)-1/(8.9)-1/(9.10)
    =1/3-1/4-(1/4-1/5)-(1/5-1/6)-(1/6-1/7)-(1/7-1/8)-(1/8-1/9)-(1/9-1/10)
    =1/3-1/4-1/4+1/10
    =-1/15
    Vậy B=-1/15
     

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222-9+11+12:2*14+14 = ? ( )

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