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

Toán Lớp 8: ( 3 – x ) ^ 2 + ( 3 + x ) ^2 – 2x^2 + x =0

Toán Lớp 8: ( 3 – x ) ^ 2 + ( 3 + x ) ^2 – 2x^2 + x =0

Comments ( 2 )

  1. Giải đáp:
    Gửi tuss nhaaa~
    Xin hn + 5sao + cam ơn!!!
    #Mii
    Lời giải và giải thích chi tiết:
     

    toan-lop-8-3-2-3-2-2-2-0

  2. $(3-x)^2+(3+x)^2-2x^2+x=0$
    $⇔ (9-6x+x^2)+(9+6x+x^2)-2x^2+x=0$
    $⇔ 18+2x^2-2x+x=0$
    $⇔ 18+x=0$
    $⇔ x=-18$
    Vậy $S=\{-18\}$

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

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