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

Toán Lớp 8: 1) 4x-6xy 2) 2x(x-1)-(x-1) 3) 7(x-3)-x(6-2x) ( giúp em theo cách phân tích thành nhân tử ạ )

Toán Lớp 8: 1) 4x-6xy
2) 2x(x-1)-(x-1)
3) 7(x-3)-x(6-2x) ( giúp em theo cách phân tích thành nhân tử ạ )

Comments ( 2 )

  1. 1) 4x – 6xy
    = 2x(2 – 3y)
    2) 2x(x – 1) – (x – 1)
    = (x – 1) (2x – 1)
    3) 7(x – 3) – x(6 – 2x)
    = 7(x – 3) – x.2(3 – x)
    = 7(x – 3) + 2x(x – 3)
    = (x – 3) (7 + 2x) 
    Chúc bn học tốt!!!!
    vote 5*, ctlhn nha bn
     

  2. 1, 4x – 6xy
    = 2x . (2 – 3y)
    2, 2x(x – 1) – (x – 1)
    = (x – 1) . (2x – 1)
    3, 7(x – 3) – x(6 – 2x)
    = 7(x – 3) – 6x + 2x^2
    = 7(x – 3) – 2x(3 + x)
    = 7(x – 3) + 2x(x – 3)
    = (x – 3) . (7 – 2x)
    Gửi bạn
     

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