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

Toán Lớp 6: (1/1×2+1/2×3+1/3×4+–+1/99×100)xX=33/100

Home/ Toán Lớp 6: (1/1×2+1/2×3+1/3×4+–+1/99×100)xX=33/100

Toán Lớp 6: (1/1×2+1/2×3+1/3×4+–+1/99×100)xX=33/100

Tháng Hai 22, 2023 Toán học 2 Comments 0 views

Toán Lớp 6: (1/1×2+1/2×3+1/3×4+……..+1/99×100)xX=33/100

Comments ( 2 )

  1. maitrucloan
    maitrucloan
    22 Tháng Hai, 2023 at 7:33 chiều
    Reply
    Giải đáp:
    (\frac{1}{1.2} + \frac{1}{2.3} + \frac{1}{3.4} + … + \frac{1}{99.100}) × x = \frac{33}{100}
    (1 – \frac{1}{2} + \frac{1}{2} – \frac{1}{3} + \frac{1}{3} – \frac{1}{4} + … + \frac{1}{99} – \frac{1}{100}) × x = \frac{33}{100}
    (1 – \frac{1}{100}) × x = frac{33}{100}
    \frac{99}{100} × x = \frac{33}{100}
    x = \frac{33}{100} : \frac{99}{100}
    x = \frac{1}{3}
    Vậy x = \frac{1}{3}.
    Chúc học tốt!!!
     

  2. doanthulan
    doanthulan
    22 Tháng Hai, 2023 at 7:33 chiều
    Reply
    ( \frac{1}{1xx2} + \frac{1}{2xx3} + \frac{1}{3xx4} + …. + \frac{1}{99xx100} )xx x = 33/100
    ( 1- 1/2 + 1/2 – 1/3 + 1/3 – 1/4 + …..+ 1/99 – 1/100)  xx x = 33/100
    ( 1 – 1/100)  xx x = 33/100
    99/100 xx x        = 33/100
                   x           = 33/100 : 99/100
                   x           = 33/100 . 100/99
                   x            = 1/3
    Vậy x = 1/3

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

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