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

Toán Lớp 8: Tìm x biết: a) 3x – 6 = 0 b) x (x + 1) – x – 1 = 0 c) x(x – 2) – 7(x – 2 ) = 0

Toán Lớp 8: Tìm x biết:
a) 3x – 6 = 0
b) x (x + 1) – x – 1 = 0
c) x(x – 2) – 7(x – 2 ) = 0

Comments ( 2 )

  1. a/ 3x-6=0
    ⇔ 3x=6
    ⇔ x=2
    b/ x(x+1)-x-1=0
    ⇔ x(x+1)-(x+1)=0
    ⇔ (x-1)(x+1)=0
    ⇔ x=1 hoặc x=-1
    c/ x(x-2)-7(x-2)=0
    ⇔ (x-7)(x-2)=0
    ⇔ x=7 hoặc x=2

  2. #andy
    a) 3x – 6 = 0
    3x = 6
     x = 2
    b) x (x + 1) – x – 1 = 0
    x (x + 1) – (x + 1) = 0
    (x1)(x+1)=0
    x = 1 hay x = -1
    c)  x(x+2)
    x=7 hoặc
     

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

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