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

Toán Lớp 8: x^2+x-y^2+y helppppppppppppppppppppp

Toán Lớp 8: x^2+x-y^2+y helppppppppppppppppppppp

Comments ( 2 )

  1. $x^2+x-y^2+y$
    $=(x^2-y^2)+(x+y)$
    $=(x+y)(x-y)+(x+y)$
    $=(x+y)(x-y+1)$

  2. x^(2)+x-y^(2)+y
    =x^(2)-y^(2)+x+y
    =(x-y)(x+y)+(x+y)
    =(x+y)(x-y+1)
    #Study well

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