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

Toán Lớp 5: 1/2 + 1/4 + 1/8 + 1/16 + -… + 1/256 + 1/512 nhanh 10đ đó

Toán Lớp 5: 1/2 + 1/4 + 1/8 + 1/16 + ……. + 1/256 + 1/512
nhanh
10đ đó

Comments ( 2 )

  1. Giải đáp + Lời giải và giải thích chi tiết:
    $\frac{1}{2}$ $+$ $\frac{1}{4}$ $+$ $\frac{1}{8}$ $+$ $\frac{1}{16}$ $+$ ….$+$ $\frac{1}{256}$ $+$ $\frac{1}{512}$
    $=$ $\frac{1}{2}$ $+$ $\frac{1}{4}$ $+$ $\frac{1}{8}$ $+$ $\frac{1}{32}$ $+$ $\frac{1}{64}$ $+$ $\frac{1}{128}$ $+$ $\frac{1}{256}$ $+$ $\frac{1}{512}$
    $=$ $\frac{256}{512}$ $+$ $\frac{128}{512}$ $+$ $\frac{64}{512}$ $+$ $\frac{32}{512}$ $+$ $\frac{16}{512}$ $+$ $\frac{8}{512}$ $+$ $\frac{4}{512}$ $+$ $\frac{2}{512}$ $+$ $\frac{1}{512}$
    $=$ $\frac{511}{512}$
    $@Phuow$
     

  2. 1/2 + 1/4 + 1/8 +….+1/512
    = 1 – 1/2 + 1/2 – 1/4 + 1/4 – …..+ 1/512 – 1/512
    = 1- 1/512
    = 511/512
     

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