a: =>x=-5x4:2=-10
b: =>48/x=8
hay x=6
c: \(\Leftrightarrow x=-14\cdot\dfrac{3}{2}=-21\)
d: \(\Leftrightarrow\dfrac{5}{x}=\dfrac{-1}{5}\)
hay x=-25
e: \(\Leftrightarrow x-2=12\)
hay x=14
f: \(\Leftrightarrow x+3=-5\)
hay x=-8
g: \(\Leftrightarrow x^2=100\)
hay \(x\in\left\{10;-10\right\}\)
h: \(\Leftrightarrow xy=-6\)
hay \(\left(x,y\right)\in\left\{\left(1;-6\right);\left(-6;1\right);\left(-1;6\right);\left(6;-1\right);\left(2;-3\right);\left(-3;2\right);\left(-2;3\right);\left(3;-2\right)\right\}\)
i: =>\(-4\left(x-5\right)=3x+6\)
=>-4x+20=3x+6
=>-7x=-14
hay x=2
k: =>3(x+1)=2(x-2)
=>3x+3=2x-4
hay x=-7
\(h.\dfrac{-2}{y}=\dfrac{x}{3}\left(đk:y\ne0\right)\)
\(\Leftrightarrow xy=-6\)
\(x=-\dfrac{6}{y}\left(với.y\ne0\right)\)
\(a,\dfrac{x}{4}=\dfrac{-5}{2}\Leftrightarrow-20=2x\Leftrightarrow x=-10\)
\(b,\dfrac{48}{x}=\dfrac{32}{4}\Leftrightarrow\dfrac{48}{x}=8\Leftrightarrow x=6\)
\(c,\dfrac{2}{3}=\dfrac{-14}{x}\Leftrightarrow2x=-42\Leftrightarrow x=-21\)
\(d,\dfrac{5}{x}=\dfrac{7}{-35}\Leftrightarrow\dfrac{5}{x}=\dfrac{1}{-5}\Leftrightarrow x=-25\)
những câu b, c, d, g, h, i, k thì bạn chú ý cho cả điều kiện của x nữa nhé
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