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\(\frac{x}{0,16}=\frac{9}{x}\Rightarrow x^2=\frac{36}{25}\Rightarrow x=\frac{6}{5}\)hoặc \(x=-\frac{6}{5}\)
\(\left(x-\frac{7}{3}\right):2\frac{3}{21}+\frac{3}{5}=0,16\)
<=> \(\left(x-\frac{7}{3}\right):\frac{45}{21}+\frac{3}{5}=\frac{4}{25}\)
<=> \(\left(x-\frac{7}{3}\right):\frac{15}{7}=-\frac{11}{25}\)
<=> \(x-\frac{7}{3}=\frac{-33}{35}\)
<=> \(x=\frac{146}{105}\)
\(\left(x+\frac{5}{6}\right).2\frac{2}{5}-1\frac{1}{4}=0,35\)
<=> \(\left(x+\frac{5}{6}\right).\frac{12}{5}-\frac{5}{4}=\frac{7}{20}\)
<=> \(\left(x+\frac{5}{6}\right).\frac{12}{7}=\frac{8}{5}\)
<=> \(x+\frac{5}{6}=\frac{14}{15}\)
<=> \(x=\frac{1}{10}\)
học tốt
a: Vì x/3=y/3 nên x=y
mà x+y=10
nên x=y=10/2=5
b: \(=\left(4+\dfrac{3}{4}-\dfrac{3}{4}\right)+\left(\dfrac{5}{19}+\dfrac{14}{19}\right)+1.5=5.5+1=6.5\)
c: \(=9\cdot\dfrac{1}{3}-7+\left(-125\right):5=3-7-25=-29\)
\(\frac{4}{x}=\frac{x}{0,16}\)
\(x\cdot x=4\cdot0,16\)
\(x^2=\frac{16}{25}\)
\(x^2=\left(\frac{\pm4}{5}\right)^2\)
\(\Rightarrow x\in\left\{\frac{4}{5};\frac{-4}{5}\right\}\)
\(\frac{4}{x}=\frac{x}{0.16}\)
\(\Rightarrow x\cdot x=4\cdot0.16\)
\(x^2=4\cdot0.16\)
\(x^2=\frac{16}{25}\)
\(\Rightarrow\orbr{\begin{cases}x=\left(\frac{4}{5}\right)^2\\\left(\frac{-4}{5}\right)^2\end{cases}}\)