x - 1 phần 12 = 25/x - 1
ai nhanh nhất mình tick cho thanks
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0,44 x (\(x+x\times\) 5 - \(\dfrac{23}{55}\)) + \(\dfrac{3}{14}\) x 2,24 = 1
0,44 x (\(x+x\times\)5 - \(\dfrac{23}{55}\)) + 0,48 = 1
0,44 x (\(x+x\times\) 5 - \(\dfrac{23}{55}\)) = 1 - 0,48
0,44 x (\(x+x\times5\) - \(\dfrac{23}{55}\)) = 0,52
\(x+x\times5\) - \(\dfrac{23}{55}\) = 0,52 : 0,44
\(x\) x (1 + 5) -\(\dfrac{23}{55}\) = \(\dfrac{13}{11}\)
\(x\) x 6 - \(\dfrac{66}{10}\) = \(\dfrac{13}{11}\) + \(\dfrac{23}{55}\)
\(x\) x 6 = \(\dfrac{65}{55}\) + \(\dfrac{23}{55}\)
\(x\times\) 6 = \(\dfrac{8}{5}\)
\(x\) x 6 = \(\dfrac{8}{5}\) : 6
\(x\) = \(\dfrac{4}{15}\)
Vậy \(x=\dfrac{4}{15}\)
25+(2.x-12)=17
=>(2.x-12)=17-25
=>2.x-12=-8
=>2.x=-8+12
=>2.x=4
=>x=4:2
=>x=2
Vậy x=2
Chúc bạn học giỏi !
( x + 1) + ( x + 2) = 17
=> 2x + 3 = 17
=> 2x = 14
=> x = 7
b, tương tự
c, ( 4 - x) . 9 - 26 : 13 = 25
=> (4-x) . 9 -26 = 325
=> (4 - x) . 9 = 351
=> 4 - x = 39
=> x = -35
\(x\times13\frac{1}{3}=\left(x+25\right)\times12\frac{1}{2}\)
\(\Rightarrow x\times\frac{40}{3}=x\times12\frac{1}{2}+25\times12\frac{1}{2}\)
\(\Rightarrow x\times\frac{40}{3}=x\times\frac{25}{2}+25\times\frac{25}{2}\)
\(\Rightarrow x\times\frac{40}{3}=x\times\frac{25}{2}+\frac{625}{2}\)
\(\Rightarrow x\times\frac{40}{3}-x\times\frac{25}{2}=\frac{625}{2}\)
\(\Rightarrow x\times\left(\frac{40}{3}-\frac{25}{2}\right)=\frac{625}{2}\)
\(\Rightarrow x\times\frac{5}{6}=\frac{625}{2}\Rightarrow x=\frac{625}{2}:\frac{5}{6}=\frac{625}{2}\cdot\frac{6}{5}=375\)
Vậy x = 375
Ta có :\(\frac{x-1}{12}=\frac{25}{x-1}\)\(\Rightarrow\left(x-1\right)\left(x-1\right)=12.25\)
\(\Rightarrow\left(x-1\right)^2=300\)
\(\Rightarrow x\in\varnothing\)
\(\frac{x-1}{12}=\frac{25}{x-1}\)
\(\Rightarrow\left(x-1\right)^2=300\)
\(\Rightarrow\left(x-1\right)^2-(10\sqrt{3})^2=0\)
\(\Rightarrow(x-1-10\sqrt{3})\left(x-1+10\sqrt{3}\right)=0\)
\(\Rightarrow\hept{\begin{cases}x=1+10\sqrt{3}\\x=1-10\sqrt{3}\end{cases}}\)