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

Toán Lớp 8: Rút gọn BT: (x-y+z)^2 + (z-y)^2 + 2(x-y+z)(y-z) GẤPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPP

Toán Lớp 8: Rút gọn BT: (x-y+z)^2 + (z-y)^2 + 2(x-y+z)(y-z)
GẤPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPP

Comments ( 2 )

  1. Giải đáp:
     (x-y+z)^2+(z-y)^2+2(x-y+z)(y-z)=x^2
    Lời giải và giải thích chi tiết:
     (x-y+z)^2+(z-y)^2+2(x-y+z)(y-z)
    =(x-y+z)^2+(y-z)^2+2(x-y+z)(y-z)
    =(x-y+z)^2+2(x-y+z)(y-z)+(y-z)^2
    =[(x-y+z)+(y-z)]^2
    =(x-y+z+y-z)^2
    =x^2
    Vậy  (x-y+z)^2+(z-y)^2+2(x-y+z)(y-z)=x^2

  2. Giải đáp: $x^2$.
    Lời giải và giải thích chi tiết:
    $(x-y+z)^2 + (z-y)^2 + 2(x-y+z)(y-z)$
    $= (x-y+z)^2 – 2(x-y+z)(z-y) + (z-y)^2$
    $= [(x-y+z) – (z-y)]^2$
    $= (x-y+z-z+y)^2$
    $= x^2$.
     

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

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