Tìm x:
a) x/27=-2/3.6
b) -0.52:x=-9.36:16.38
c) 4.25/2.875=x/1.16
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Cách 1 : -0,52 : x = -9,36 : 16,83
-0,52 : x = -\(\frac{104}{187}\)
x = -0,25 : -\(\frac{104}{187}\)
x = \(\frac{187}{416}\)
Cách 2 : -0,52 : x = -9,36 : 16,83
=> \(\frac{-0.25}{x}\) = \(\frac{-9.36}{16.83}\)
=>x. (-9,36) = -0,25. 16,83
x.(-9,36) = -4,2075
x = -4,2075 : (-9,36)
x = \(\frac{187}{416}\)
a.\(\dfrac{1}{3}\) + x = \(\dfrac{5}{6}\)
x = \(\dfrac{5}{6}\) - \(\dfrac{1}{3}\)
x = \(\dfrac{1}{2}\)
b. | x-1| - \(\dfrac{2}{5}\) = \(\dfrac{11}{10}\)
| x-1| = \(\dfrac{11}{10}\) + \(\dfrac{2}{5}\)
|x-1| = \(\dfrac{3}{2}\)
\(\left[{}\begin{matrix}x-1=\dfrac{3}{2}\\x-1=-\dfrac{3}{2}\end{matrix}\right.\)
\(\left[{}\begin{matrix}x=\dfrac{3}{2}+1\\x=-\dfrac{3}{2}+1\end{matrix}\right.\)
\(\left[{}\begin{matrix}x=\dfrac{5}{2}\\x=-\dfrac{1}{2}\end{matrix}\right.\)
c, \(\dfrac{1}{3}\) + \(\dfrac{2}{3}\) ( \(\dfrac{x}{2}\) + 3) = 1
\(\dfrac{2}{3}\) (\(\dfrac{x}{2}\) + 3) = 1 - \(\dfrac{1}{3}\)
\(\dfrac{2}{3}\) ( \(\dfrac{x}{2}\) + 3) = \(\dfrac{2}{3}\)
\(\dfrac{x}{2}\) + 3 = 1
\(\dfrac{x}{2}\) = 1 - 3
\(\dfrac{x}{2}\) = -2
\(x\) = -4
d, \(\dfrac{x+2}{3}\) = \(\dfrac{27}{x+2}\)
(x+2)2 = 27.3
(x+2) =92
\(\left[{}\begin{matrix}x+2=9\\x+2=-9\end{matrix}\right.\)
\(\left[{}\begin{matrix}x=7\\x=-11\end{matrix}\right.\)
a) Ta có: \(\left(2x-1\right)\left(x^2-x+1\right)=2x^3-3x^2+2\)
\(\Leftrightarrow2x^3-2x^2+2x-x^2+x-1-2x^3+3x^2-2=0\)
\(\Leftrightarrow3x=3\)
hay x=1
Vậy: S={1}
b) Ta có: \(\left(x+1\right)\left(x^2+2x+4\right)-x^3-3x^2+16=0\)
\(\Leftrightarrow x^3+2x^2+4x+x^2+2x+4-x^3-3x^2+16=0\)
\(\Leftrightarrow6x=-20\)
hay \(x=-\dfrac{10}{3}\)
c) Ta có: \(\left(x+1\right)\cdot\left(x+2\right)\left(x+5\right)-x^3-8x^2=27\)
\(\Leftrightarrow\left(x^2+3x+2\right)\left(x+5\right)-x^3-8x^2-27=0\)
\(\Leftrightarrow x^3+5x^2+3x^2+15x+2x+10-x^3-8x^2-27=0\)
\(\Leftrightarrow17x=17\)
hay x=1
a: \(\Leftrightarrow\left(x-1\right)^2=81\)
\(\Leftrightarrow\left[{}\begin{matrix}x-1=9\\x-1=-9\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=10\\x=-8\end{matrix}\right.\)
\(-0.5x:x=-9.36:16.38\)
\(\Leftrightarrow-0.5x:x=-\frac{4}{7}\)
\(\Leftrightarrow-\frac{1}{2}x:x=-\frac{4}{7}\Leftrightarrow\left(-\frac{1}{2}:1\right)x=-\frac{4}{7}\)
\(\Leftrightarrow-\frac{1}{2}x=-\frac{4}{7}\Leftrightarrow x=\left(-\frac{4}{7}\right):\left(-\frac{1}{2}\right)\)
\(x=1\frac{1}{7}\Leftrightarrow x=\frac{8}{7}\)
xin lỗi tai mik lười nên mik viết nha pạn ...
- bạn tính phép tính về bên phải trước
- rồi lấy -0,5 chia cho kết qur vừa tìm là ra x nha
~ hok tốt ~
a) \(\frac{x}{27}=-\frac{2}{3}.6\)
\(\frac{x}{27}=-4\)
\(x:27=-4\)
\(x=-4.27\)
\(x=-108\)
Rồi tương tự nha