\(\left(\dfrac{9}{4}x-0,5\right):1\dfrac{3}{4}=1\)
\(\left(\dfrac{9}{4}x-0,5\right):\dfrac{7}{4}=1\)
\(\dfrac{9}{4}x-0,5=1.\dfrac{7}{4}\)
\(\dfrac{9}{4}x-0,5=\dfrac{7}{4}\)
\(\dfrac{9}{4}x=\dfrac{7}{4}+0,5\)
\(\dfrac{9}{4}x=\dfrac{7}{4}+\dfrac{1}{2}\)
\(\dfrac{9}{4}x=\dfrac{9}{4}\)
\(x=\dfrac{9}{4}:\dfrac{9}{4}\)
\(x=1\)
`7/x = x/28`
`x.x = 7 xx 28`
` x.x = 196`
` x^2 = 196`
` -> x = 14`
Vậy `x = 14`
7/x=x/28
=> x.x=7.28
=> x^2 =196
=> x^2 = 14^2
=> x= 14
x= -14
Vay x ∈ { 14, -14 }
\(\left(\dfrac{9}{4}x-0,5\right):\dfrac{7}{4}=1\\ \left(\dfrac{9}{4}x-0,5\right)=1.\dfrac{7}{4}\\ \left(\dfrac{9}{4}x-0,5\right)=\dfrac{7}{4}\\ \dfrac{9}{4}x=\dfrac{7}{4}+0,5\\ \dfrac{9}{4}x=\dfrac{9}{4}\\ x=1\)
\(b,\dfrac{7}{x}=\dfrac{x}{28}\\ 7.28=x.x\\ 196=x^2\\ \left[\begin{matrix}x=14\\x=-14\end{matrix}\right]\)
