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

Toán Lớp 8: X^2-4x-3 ====- (X-1).(x+2) Rút gọn ạ(làm kĩ nha)

Toán Lớp 8: X^2-4x-3
————-
(X-1).(x+2)
Rút gọn ạ(làm kĩ nha)

Comments ( 2 )

  1. \qquad (x^2-4x+3)/((x-1)(x+2)) ĐK:x\ne1;x\ne-2
    =(x^2-x-3x+3)/((x-1)(x+2))
    =(x(x-1)-3(x-1))/((x-1)(x+2))
    =((x-1)(x-3))/((x-1)(x+2))
    =(x-3)/(x+2)
     

  2. Giải đáp:
    Mik sửa đề ạ :
    (x^2 – 4x + 3)/((x-1)(x+2)) ĐKXĐ: x≠1; -2
    =  (x^2 – 3x – x + 3)/((x-1)(x+2))
    = (x(x-3)-(x-3))/((x-1)(x+2))
    =((x-1)(x-3))/((x-1)(x+2))
    = (x-3)/(x+2)

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