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

Toán Lớp 5: 1/1×2 + 1/2×3 + 1/3×4 + … 1/99×100 Giup toi voi

Toán Lớp 5: 1/1×2 + 1/2×3 + 1/3×4 + … 1/99×100
Giup toi voi

Comments ( 2 )

  1. Giải đáp + Lời giải và giải thích chi tiết:
    1/{1×2}+1/{2×3}+1/{3×4}+….+1/{99×100}
    =1-1/2+1/2-1/3+1/3-1/4+…+1/99-1/100
    =1-1/100
    =99/100
     

  2. $\text{ $\dfrac{1}{1×2}$ + $\dfrac{1}{2×3}$ + $\dfrac{1}{3×4}$ + … + $\dfrac{1}{99×100}$ }$
    $\text{ = 1 – $\dfrac{1}{2}$ + $\dfrac{1}{2}$ – $\dfrac{1}{3}$ + $\dfrac{1}{3}$ – $\dfrac{1}{4}$ + … + $\dfrac{1}{99}$ – $\dfrac{1}{100}$ }$
    $\text{ = 1 – $\dfrac{1}{100}$ }$
    $\text{ = $\dfrac{99}{100}$ }$

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

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