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

Toán Lớp 7: ính giá trị biếu thức a=1/3-1/7-1/13/2/3-2/7-2/13.3/4-3/16-364-3/256/1-1/4-1/16-/1/64 +5/8

Toán Lớp 7: ính giá trị biếu thức a=1/3-1/7-1/13/2/3-2/7-2/13.3/4-3/16-364-3/256/1-1/4-1/16-/1/64 +5/8

Comments ( 2 )

  1. Giải đáp:
    A=1.
    Lời giải và giải thích chi tiết:
    $A=\dfrac{\dfrac{1}{3}-\dfrac{1}{7}-\dfrac{1}{13}}{\dfrac{2}{3}-\dfrac{2}{7}-\dfrac{2}{13}}\cdot\dfrac{\dfrac{3}{4}-\dfrac{3}{16}-\dfrac{3}{64}-\dfrac{3}{256}}{1-\dfrac{1}{4}-\dfrac{1}{16}-\dfrac{1}{64}}+\dfrac{5}{8}\\\Rightarrow A=\dfrac{\dfrac{1}{3}-\dfrac{1}{7}-\dfrac{1}{13}}{2\ .\left(\dfrac{1}{3}-\dfrac{1}{7}-\dfrac{1}{13}\right)}\cdot\dfrac{\dfrac{3}{4}-\dfrac{3}{16}-\dfrac{3}{64}-\dfrac{3}{256}}{\dfrac{4}{4}-\dfrac{4}{16}-\dfrac{4}{64}-\dfrac{4}{256}}+\dfrac{5}{8}\\\Rightarrow A=\dfrac{1}{2}\cdot\dfrac{3\ . \left(\dfrac{1}{4}-\dfrac{1}{16}-\dfrac{1}{64}-\dfrac{1}{256}\right)}{4\ . \left(\dfrac{1}{4}-\dfrac{1}{16}-\dfrac{1}{64}-\dfrac{1}{256}\right)}+\dfrac{5}{8}\\\Rightarrow A=\dfrac{1}{2}\cdot\dfrac{3}{4}+\dfrac{5}{8}\\\Rightarrow A=\dfrac38+\dfrac58\\\Rightarrow A=1$
    Vậy A=1.

  2. Giải đáp + Lời giải và giải thích chi tiết:
     a = (1/3 – 1/7 – 1/13)/(2/3 – 2/7 – 2/13) . (3/4 – 3/16 – 3/64 – 3/256)/(1 – 1/4  – 1/16 – 1/64) + 5/8
        = (1/3 – 1/7 – 1/13)/( 2 . (1/3 – 1/7 – 1/13)) . ( 3 . (1/4 – 1/16 – 1/64 – 1/256))/( 4 . (1/4 – 1/16 – 1/64 – 1/256)) + 5/8
        = 1/2 . 3/4 + 5/8
        = 3/8 + 5/8
        = 8/8 = 1
     

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