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

Toán Lớp 12: y=2x ^4+1 đồng biến trên khoảng nào

Toán Lớp 12: y=2x ^4+1 đồng biến trên khoảng nào

Comments ( 1 )

  1. y=2x^4+1
    TXĐ: D=RR
    y’=8x^3
    y’=0<=>8x^3=0
    <=>x=0
    BBT:
    \begin{array}{|c|cc|}\hline \text{$x$}&\text{$-\infty$}&\text{}&\text{0}&\text{}&\text{$+\infty$}\\\hline \text{$y’$}&\text{}&\text{}-&\text{0}&\text{}+&\text{}\\\hline \text{$y$}&\text{}&\text{$\searrow$}&\text{}&\text{}\nearrow\\&&&1\\\hline \end{array}
     Vậy hàm số đã cho đồng biến trên khoảng (0;+\infty)

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

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