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

Toán Lớp 9: tìm x √x < √2 √2x <4 √x > √3 2√x>10

Toán Lớp 9: tìm x
√x < √2 √2x <4 √x > √3
2√x>10

Comments ( 1 )

  1. Giải đáp:
    $1/$
    $\sqrt{x}<\sqrt{2}$
    <=> $(\sqrt{x})^2<(\sqrt{2})^2$
    => $x<2$
     Vậy S={x|x<2}
    $2/$
    $\sqrt{2x}<4$
    <=>$(\sqrt{2x})^2<4^2$
    <=> $2x<16$
    => $x<8$
       Vậy S={x|x<8}
    $3/$
    $\sqrt{x}>\sqrt{3}$
    <=> $(\sqrt{x})^2>(\sqrt{3})^2$
    => $x>3$
        Vậy S={x|x>3}
    $4/$
    $2\sqrt{x}>10$
    <=> $\sqrt{x}>5$
    <=> $(\sqrt{x})^2>5^2$
    <=> $x>25$
          Vậy S={x|x>25}

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

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