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Ta có: \(\left|3x+1\right|+\left|3x-5\right|=\left|3x+1\right|+\left|5-3x\right|\ge\left|3x+1+5-3x\right|=6\)(1)
\(\frac{12}{\left(y+3\right)^2+2}\le\frac{12}{2}=6\)(2)
\(\left(1\right);\left(2\right)\Rightarrow VT\ge VP."="\Leftrightarrow\hept{\begin{cases}-\frac{1}{3}\le x\le\frac{5}{3}\\y=-3\end{cases}}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a)72x+72x.49=2450
72x.50=2450
72x=2450:50=49
72x=72
2x=2
x=1
b)(33:11)x=81
3x=81
3x=34
x=4
c)1/6=2/3:8x
8x=2/3:1/6
8x=4
x=1/2
d)(x+1)3=64
(x+1)3=43
x+1=4
x=3
minh chỉ lam đc vậy thôi nha !hi hi
![](https://rs.olm.vn/images/avt/0.png?1311)
\(5\frac{4}{7}\): [ x : 1,3 + 8,4 . \(\frac{6}{7}\). ( 6 - \(\frac{\left(2,3+5\div6,25\right)\times7}{8\times0,-125+6,9}\)) ] = \(1\frac{1}{14}\)
\(\frac{39}{7}\): [ x : 1,3 + \(\frac{36}{5}\). ( 6 - \(\frac{\left(2,3+0,8\right).7}{0,1+6,9}\)) ] = \(\frac{15}{14}\)
\(\frac{39}{7}\): [ x : 1,3 + \(\frac{36}{5}\). ( 6 - \(\frac{3,1.7}{7}\)) ] = \(\frac{15}{14}\)
\(\frac{39}{7}\): [ x : 1,3 + \(\frac{36}{5}\). ( 6 - 3,1 ) ] = \(\frac{15}{14}\)
x : 1,3 + \(\frac{36}{5}\). 2,9 = \(\frac{39}{7}\): \(\frac{15}{14}\)
x : 1,3 + 20,88 = 5,2
x : 1,3 = - 15,68
x = - 15,68 . 1,3
x = - 20,384
ta có
\(5\frac{4}{7}:\left\{x:1,3+8,4.\frac{6}{7}.\left[6-\frac{\left(2,3+5:6,25\right).7}{8.0,0125+6,9}\right]\right\}=1\frac{1}{14}\)
\(\Leftrightarrow\frac{39}{7}:\left\{x:1,3+7,2.\left[6-\frac{\left(2,3+0,8\right).7}{0,1+6,9}\right]\right\}=\frac{15}{14}\)
\(\Leftrightarrow\frac{39}{7}:\left\{x:1,3+7,2.\left[6-\frac{3,1.7}{7}\right]\right\}=\frac{15}{14}\)
\(\Leftrightarrow\frac{39}{7}:\left\{x:1,3+7,2.2,9\right\}=\frac{15}{14}\Leftrightarrow\left\{x:1,3+7,2.2,9\right\}=\frac{39}{7}:\frac{15}{14}\)
\(\Leftrightarrow x:1,3+20,88=5,2\Leftrightarrow x:1,3=-15,68\Leftrightarrow x=-20,384\)
![](https://rs.olm.vn/images/avt/0.png?1311)
( 3x - 1/2 ) + ( 1/2y + 3/5 ) = 0
=> ( 3 x - 1/2 ) = 0
3x = 0+1/2
3x = 1/2
x = 1/2 : 3
x = 1/6
=> ( 1/2 y + 3/5 ) = 0
1/2y = 0 - 3/5
1/2 y = -3/5
y = -3/5 : 1/2
y = -6/5
![](https://rs.olm.vn/images/avt/0.png?1311)
3. Tìm x biết: |15-|4.x||=2019
\(\Rightarrow\orbr{\begin{cases}15-\left|4x\right|=2019\\15-\left|4x\right|=-2019\end{cases}\Rightarrow\orbr{\begin{cases}\left|4x\right|=-2004\\\left|4x\right|=2034\end{cases}}}\)
vì \(4x\ge0\)\(\Rightarrow\)|4x|=2043\(\Rightarrow4x=2034\Rightarrow x=508,5\)
KL: x=508,5
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(\left(x-\frac{2}{5}\right).\left(x+\frac{3}{7}\right)0\) \(x+\frac{3}{7}-\frac{3}{7}\) \(x