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 7: Tính A = $\frac{1}{2}$ + $\frac{5}{6}$ + $\frac{11}{12}$ + $\frac{19}{20}$ + $\frac{29}{30}$ + $\frac{41}{42}$ + $\frac{55}{56}$

Home/ Toán Lớp 7: Tính A = $\frac{1}{2}$ + $\frac{5}{6}$ + $\frac{11}{12}$ + $\frac{19}{20}$ + $\frac{29}{30}$ + $\frac{41}{42}$ + $\frac{55}{56}$

Toán Lớp 7: Tính A = $\frac{1}{2}$ + $\frac{5}{6}$ + $\frac{11}{12}$ + $\frac{19}{20}$ + $\frac{29}{30}$ + $\frac{41}{42}$ + $\frac{55}{56}$

Tháng Chín 6, 2022 Toán học 2 Comments 0 views

Toán Lớp 7: Tính A = $\frac{1}{2}$ + $\frac{5}{6}$ + $\frac{11}{12}$ + $\frac{19}{20}$ + $\frac{29}{30}$ + $\frac{41}{42}$ + $\frac{55}{56}$ + $\frac{71}{72}$ + $\frac{89}{90}$

Comments ( 2 )

  1. hiennhi98
    hiennhi98
    6 Tháng Chín, 2022 at 2:28 sáng
    Reply
    Đáp án:
     
    Giải thích các bước giải:
     

    toan-lop-7-tinh-a-frac-1-2-frac-5-6-frac-11-12-frac-19-20-frac-29-30-frac-41-42-frac-55-56

  2. ngocle44
    ngocle44
    6 Tháng Chín, 2022 at 2:28 sáng
    Reply
    Tính :
    A = $\frac{1}{2}$ + $\frac{5}{6}$ + $\frac{11}{12}$ + $\frac{19}{20}$ + $\frac{29}{30}$ + $\frac{41}{42}$ + $\frac{55}{56}$ + $\frac{71}{72}$ + $\frac{89}{90}$ 
    = $\text{A}$ – ( 1 -$\frac{1}{2}$ ) + ( 1 – $\frac{1}{6}$ ) + ( 1 – 1$\frac{1}{12}$ ) + ( 1 – $\frac{1}{20}$ ) + ( 1 – $\frac{1}{30}$ ) + ( 1 – $\frac{1}{42}$ ) + ( 1 – $\frac{1}{56}$ ) + ( 1 – $\frac{1}{72}$  ) + ( 1 – $\frac{1}{90}$ 
    ⇒ $\text{A}$ = 9 – ( $\frac{1}{2}$ + $\frac{1}{6}$ + $\frac{1}{12}$ + $\frac{1}{20}$ + $\frac{1}{30}$ + $\frac{1}{42}$ + $\frac{1}{56}$ + $\frac{1}{72}$ + $\frac{1}{90}$ )
    ⇒ $\text{A}$ = 9 – ( $\frac{1}{1×2}$ + $\frac{1}{2×3}$ + $\frac{1}{3×4}$ + $\frac{1}{4×5}$ + $\frac{1}{5×6}$ + $\frac{1}{6×7}$ + $\frac{1}{7×8}$ + $\frac{1}{8×9}$ + $\frac{1}{9×10}$ )
    ⇒ $\text{A}$ = 9 – ( 1 – $\frac{1}{2}$ + $\frac{1}{2}$ – $\frac{1}{3}$ + $\frac{1}{3}$ – $\frac{1}{4}$ + $\frac{1}{4}$ – $\frac{1}{5}$ + $\frac{1}{5}$ – $\frac{1}{6}$ + $\frac{1}{6}$ – $\frac{1}{7}$ + $\frac{1}{7}$ – $\frac{1}{8}$ + $\frac{1}{8}$ – $\frac{1}{9}$ + $\frac{1}{9}$ + $\frac{1}{10}$ )
    ⇒ $\text{A}$ = 9 – ( 1 – $\frac{1}{10}$ ) 
    ⇒ $\text{A}$ = 9 – $\frac{9}{10}$ 
    ⇒ $\text{A}$ = $\frac{81}{10}$ 
    Cho mik xin hay nhất !
    $\text{#NOCOPY}$

Leave a reply

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

Cát Tiên

About Cát Tiên