Đáp án+Giải thích các bước giải:
`k)(x-1/3)(x+2/5)=0`
`⇒`\(\left[ \begin{array}{l}x-\dfrac{1}{3}=0\\x+\dfrac{2}{5}=0\end{array} \right.\)
`⇒`\(\left[ \begin{array}{l}x=0+\dfrac{1}{3}\\x=0-\dfrac{2}{5}\end{array} \right.\)
`⇒`\(\left[ \begin{array}{l}x=\dfrac{1}{3}\\x=\dfrac{-2}{5}\end{array} \right.\)
Vậy `x=1/3` hoặc `x=-2/5`
`l)(3/4x-9/(16)).(1,5+(-3)/5 : x)=0`
`⇒`\(\left[ \begin{array}{l}\dfrac{3}{4}x-\dfrac{9}{16}=0\\1,5+\dfrac{-3}{5} : x=0\end{array} \right.\)
`⇒`\(\left[ \begin{array}{l}\dfrac{3}{4}x=0+\dfrac{9}{16}\\\dfrac{-3}{5} : x=0-1,5\end{array} \right.\)
`⇒`\(\left[ \begin{array}{l}\dfrac{3}{4}x=\dfrac{9}{16}\\\dfrac{-3}{5} : x=-1,5\end{array} \right.\)
`⇒`\(\left[ \begin{array}{l}x=\dfrac{9}{16} : \dfrac{3}{4}\\x=\dfrac{-3}{5} : (-1,5)\end{array} \right.\)
`⇒`\(\left[ \begin{array}{l}x=\dfrac{3}{4}\\x=\dfrac{2}{5}\end{array} \right.\)
Vậy `x=3/4` hoặc `x=2/5`
