Register Now

Login

Lost Password

Lost your password? Please enter your email address. You will receive a link and will create a new password via email.

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

Toán Lớp 5: b/ 1/1×2 + 1/2×3 + 3×4 +==–+1/2021x2022

Toán Lớp 5: b/ 1/1×2 + 1/2×3 + 3×4 +…………………………..+1/2021x2022

Comments ( 2 )

  1. $\frac{1}{1x2}$ +$\frac{1}{2x3}$ +$\frac{1}{3x4}$ +…+$\frac{1}{2021x2022}$ 
    =1+$\frac{1}{2}$-$\frac{1}{2}$+$\frac{1}{3}$-$\frac{1}{3}$+$\frac{1}{4}$-$\frac{1}{4}$+…+$\frac{1}{2021}$+$\frac{1}{2022}$
    =1+$\frac{1}{2022}$
     =$\frac{2023}{2022}$

  2. Lời giải và giải thích chi tiết:
    1/(1 xx 2) + 1/(2 xx 3) + ………. + 1/(2021 xx 2022)
    = (2 – 1)/(1 xx 2) + (3 – 2)/(2 xx 3) + ………… + (2022 – 2021)/(2021 xx 2022)
    = 1 – 1/2 + 1/2 – 1/3 + ………… + 1/2021 – 1/2022
    = 1 – 1/2022
    = 2021/2022

Leave a reply

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

About Cát Linh