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

Toán Lớp 6: 1-1/2+2-2/3+3-3/4+4-1/4-3-1/3-2-1/2-1

Toán Lớp 6: 1-1/2+2-2/3+3-3/4+4-1/4-3-1/3-2-1/2-1

Comments ( 2 )

  1. 1 – 1/2 + 2 – 2/3 + 3 – 3/4 + 4 – 1/4 – 3 – 1/3 – 2 – 1/2 – 1
    = (1 + 2 + 3 + 4 – 3 – 2 – 1) – [(1/2 + 1/2) + (2/3 + 1/3) + (3/4 + 1/4)]
    = 4 – (1 + 1 + 1)
    = 4 – 3
    = 1

  2. Giải đáp+Lời giải và giải thích chi tiết:
    $\text{1-$\dfrac{1}{2}$+2-$\dfrac{2}{3}$+3-$\dfrac{3}{4}$+4-$\dfrac{1}{4}$-3-$\dfrac{1}{3}$-2-$\dfrac{1}{2}$-1}$
    = $\text{(1+2+3+4-3-2-1)-}$[($\dfrac{1}{2}$+$\dfrac{1}{2}$)+($\dfrac{2}{3}$+$\dfrac{1}{3}$)+($\dfrac{3}{4}$+$\dfrac{1}{4}$)]
    = $\text{4-(1+1+1)=4-3=1}$

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