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

Toán Lớp 11: cos3x/2-căn3=0 giâir nhanh lênh

Toán Lớp 11: cos3x/2-căn3=0 giâir nhanh lênh

Comments ( 1 )

  1. $cos\dfrac{3x}{2}-\sqrt[]{3}=0$
    $⇔cos\dfrac{3x}{2}=\sqrt[]{3}$
    Mà $cosx∈[-1;1]$ 
    $cos\dfrac{3x}{2}=\sqrt[]{3}>1$
    Vậy phương trình vô nghiệm
     

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