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 6: Tính. `1/2+1/4+1/8+1/16+1/32+1/64+1/128`.

Toán Lớp 6: Tính.
1/2+1/4+1/8+1/16+1/32+1/64+1/128.

Comments ( 2 )

  1. Giải đáp:
     
    Lời giải và giải thích chi tiết:
    $\frac12+\frac14+\frac18+\frac1{16}+\frac1{32}+\frac1{64}+\frac1{128}$
    $=\frac24+\frac28+\frac2{16}+\frac2{32}+\frac2{64}+\frac2{128}+1{128}$
    $=\frac48+\frac4{16}+\frac4{32}+\frac4{64}+\frac4{128}+\frac3{128}$
    Làm theo cách tương tự cho đến khi ta được $\frac{63}{128}+{64}{128}=\frac{127}{128}$
    Xin hay nhất!!!

  2. Đặt A = 1/2 + 1/4 + 1/8 + 1/16 + 1/32 + 1/64 + 1/128
    A . 2 = 1 + 1/2 + 1/4 + 1/8 + 1/16 + 1/32 + 1/64
    A . 2 – A = ( 1 + 1/2 + 1/4 + 1/8 + 1/16 + 1/32 + 1/64 ) – ( 1/2 + 1/4 + 1/8 + 1/16 + 1/32 + 1/64 + 1/128 )
    A = 1 – 1/128
    A = 127/128
     

Leave a reply

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

About Mai