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

Toán Lớp 8: Thu gọn biểu thức (3x + 2). (x – 1) Giúp mình với mn

Toán Lớp 8: Thu gọn biểu thức
(3x + 2). (x – 1)
Giúp mình với mn

Comments ( 2 )

  1. $\#Lynn2007$
    (3x+2).(x-1)
    =3x^2-3x+2x-2
    =3x^2-x-2.
     

  2. #andy
    \[\begin{array}{l}
    (3x + 2).(x – 1)\\
     \Rightarrow 3{x^2} – 3x + 2x – 2\\
     \Rightarrow 3{x^2} – x – 2
    \end{array}\]

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

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