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

Toán Lớp 9: 1/(2.3) + 1/(5.8)+…+1/(98.101)

Tháng Mười 5, 2022 Toán học 1 Comment 0 views

Toán Lớp 9: 1/(2.3) + 1/(5.8)+…+1/(98.101)

Comments ( 1 )

  1. lanthuhoa
    lanthuhoa
    5 Tháng Mười, 2022 at 4:41 chiều
    Reply
    1/(2.3)+1/(5.8)+…+1/(98.101)
    =3/3.(1/(2.5)+1/(5.8)+…+1/(98.101)
    =1/3.(3/(2.5)+3/(5.8)+…+3/(98.101)
    =1/3.(1/2-1/5+1/5-1/8+…+1/98-1/101)
    =1/3.(1/2-1/101)
    =1/3. 99/202
    =33/202

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

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