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

Toán Lớp 8: Giai phuong trinh: (x +7)(3-x) =0

Toán Lớp 8: Giai phuong trinh: (x +7)(3-x) =0

Comments ( 2 )

  1. (x+7)(3-x)=0
    <=>x+7=0 hoặc 3-x=0
    <=>x=-7 hoặc x=3
    Vậy S={-7;3}
     

  2.     $(x+7)(3-x)^{}$=$0^{}$
    ⇔\(\left[ \begin{array}{l}x+7=0\\3-x=0\end{array} \right.\) 
    ⇔\(\left[ \begin{array}{l}x=-7\\3=3\end{array} \right.\) 
    CHO MK CTLHN NHA!
     

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

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