Bài 4:
a: \(\Leftrightarrow10\sqrt[3]{x}-4\sqrt[3]{x}-3\sqrt[3]{x}=15\)
\(\Leftrightarrow3\sqrt[3]{x}=15\)
=>x=125
b: \(\Leftrightarrow\sqrt[3]{x-3}=x-3\)
\(\Leftrightarrow\left(x-3\right)^3=\left(x-3\right)\)
\(\Leftrightarrow\left(x-3\right)\left(x-4\right)\left(x-2\right)=0\)
hay \(x\in\left\{3;4;2\right\}\)