Đáp án+Giải thích các bước giải:
`a) 5x(x-2000)-x+2000=0`
`<=>5x(x-2000)-(x-2000)=0`
`<=> (5x-1)(x-2000)=0`
`<=>`\(\left[ \begin{array}{l}5x-1=0\\x-2000=0\end{array} \right.\)
`<=>`\(\left[ \begin{array}{l}5x=1\\x=2000\end{array} \right.\)
`<=>`\(\left[ \begin{array}{l}x=\dfrac{1}{5}\\x=2000\end{array} \right.\)
Vậy `x∈{1/5; 2000}`
`b) x^3 -13 =0`
`<=> x^3 = 13`
`<=> x = `$\sqrt[3]{13}$
Vậy `x=`$\sqrt[3]{13}$