Toán Lớp 9: So sánh : 2 $\sqrt[3]{5}$ và $\frac{1}{2}$ $\sqrt[3]{311}$
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Toán Lớp 9: So sánh : 2 $\sqrt[3]{5}$ và $\frac{1}{2}$ $\sqrt[3]{311}$
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Xin hay nhất ạ ụ ụ
$\dfrac12\sqrt[3]{311}=\sqrt[3]{\dfrac1{2^3}.311}<\sqrt[3]{39}$
->$\sqrt[3]{40}>\sqrt[3]{39}$->$2\sqrt[3]{5}>\dfrac12\sqrt[3]{311}$