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

Toán Lớp 8: 9(x-y)^2- (x +y )^2 phan tich dathuc thanh nhan tu duoi dang hang dang thuc

Toán Lớp 8: 9(x-y)^2- (x +y )^2 phan tich dathuc thanh nhan tu duoi dang hang dang thuc

Comments ( 2 )

  1. Giải đáp + Lời giải và giải thích chi tiết:
    9(x-y)^2-(x+y)^2
    =[3(x-y)]^2-(x+y)^2
    =(3x-3y)^2-(x+y)^2
    =[(3x-3y)-(x+y)][(3x-3y)+(x+y)]
    =(3x-3y-x-y)(3x-3y+x+y)
    =(2x-4y)(4x-2y)
     

  2. 9(x-y)^2-(x+y)^2
    =3^2(x-y)^2-(x+y)^2
    =(3x-3y)^2-(x+y)^2
    =[(3x-3y)-(x+y)][(3x-3y)+(x+y)]
    =(3x-3y-x-y)(3x-3y+x+y)
    =(2x-4y)(4x-2y)
    $\text{@ThanhTruc2008}$

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

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