a,5/y=1/2 (tìm y)
b,42/25:y/5=6/5(tìm y)
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a) 3,7 x y + 5,28 = 14,9
3,7 x y= 9,62
y = 9,62 : 3,7
y = 2,6
\(a,\Rightarrow y=\dfrac{2\cdot5}{1}=10\\ b,\Rightarrow\dfrac{y}{5}=\dfrac{42}{25}:\dfrac{6}{5}=\dfrac{7}{5}\Rightarrow y=7\)
\(a,\frac{42}{25}:\frac{y}{5}=\frac{6}{5}\)
\(\frac{y}{5}=\frac{42}{25}:\frac{6}{5}\)
\(\frac{y}{5}=\frac{42}{25}\times\frac{5}{6}\)
\(\frac{y}{5}=\frac{7}{5}\)
\(\Leftrightarrow5y=7.5\)
\(5y=35\)
\(y=7\)
\(a,\Leftrightarrow\left(y-5\right)\left(y+5\right)-\left(y+5\right)=0\\ \Leftrightarrow\left(y-6\right)\left(y+5\right)=0\\ \Leftrightarrow\left[{}\begin{matrix}y=6\\y=-5\end{matrix}\right.\)
\(b,\Leftrightarrow y\left(y+6\right)-7\left(y+6\right)=0\\ \Leftrightarrow\left(y-7\right)\left(y+6\right)=0\\ \Leftrightarrow\left[{}\begin{matrix}y=7\\y=-6\end{matrix}\right.\)
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Chưa tích cho tớ đâu nha!
a) \(\dfrac{5}{y}=\dfrac{1}{2}\)
\(y=\dfrac{5\times2}{1}=10\)
b) \(\dfrac{42}{25}:\dfrac{y}{5}=\dfrac{6}{5}\)
\(\dfrac{y}{5}=\dfrac{42}{25}:\dfrac{6}{5}\)
\(\dfrac{y}{5}=\dfrac{7}{5}\)
\(y=7\)
\(\dfrac{5}{y}=\dfrac{1}{2}\\ =>y=5.2:1=10\)
\(\dfrac{42}{25}:\dfrac{y}{5}=\dfrac{6}{5}\\ =>\dfrac{y}{5}=\dfrac{42}{25}:\dfrac{6}{5}=\dfrac{42}{25}.\dfrac{5}{6}=\dfrac{7}{5}\\ =>y=\dfrac{7}{5}.5=7\)