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

Toán Lớp 7: $1^{3}$ +$2^{3}$ +$3^{3}$+-..+ $10^{3}$= $(x+1)^{2 }$ helpppp

Toán Lớp 7: $1^{3}$ +$2^{3}$ +$3^{3}$+……+ $10^{3}$= $(x+1)^{2
}$
helpppp

Comments ( 2 )

  1. 1³ + 2³ + 3³ + … + 10³ = ( x + 1 )²
    ⇒ 3025 = ( x + 1 )²
    ⇒ \(\left[ \begin{array}{l}(x+1)^{2}=(-55)^{2}\\(x+1)^{2}=55^{2}\end{array} \right.\) 
    ⇒ \(\left[ \begin{array}{l}x+1=-55\\x+1=55\end{array} \right.\) 
    ⇒ \(\left[ \begin{array}{l}x=-55-1=-56\\x=55-1=54\end{array} \right.\) 

  2. Giải đáp:
    Lời giải và giải thích chi tiết:
    13+23+33+…+103=(x+1)2
    ⇒3025=(x+1)2
    ⇒(x+1)2=(−55)2;(−55)2
    ⇒x+1=55;−55

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