Toán Lớp 8: Tìm x, biết: a) x mũ 3 – 0,16x= 0
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Toán Lớp 8: Tìm x, biết: a) x mũ 3 – 0,16x= 0
Comments ( 2 )
{x^2} – 0,16x = 0\\
\Leftrightarrow x({x^2} – 0,16) = 0\\
\Leftrightarrow x({x^2} – 0,16) = 0\\
\Leftrightarrow x = 0\,\,\,\,hay\,\,\,\,\, \Leftrightarrow \,{x^2} – 0,16 = 0\\
\Leftrightarrow x = 0\,\,\,\,hay\,\,\,\,\, \Leftrightarrow {x^2} = 0,16\\
\Leftrightarrow x = 0\,\,\,\,hay\,\,\,\,\, \Leftrightarrow x = \pm 0,4\\
\Rightarrow x = \{ 0; \pm 0,4\}
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