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\(1\frac{2}{3}:\frac{x}{4}=6:0,3\)
\(\frac{5}{3}:\frac{x}{4}=20\)
\(\Rightarrow\frac{x}{4}=\frac{5}{3}:20\)
\(\Rightarrow\frac{x}{4}=\frac{1}{12}\Rightarrow x=\frac{4}{12}=\frac{1}{3}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(\frac{-3}{7}+x=\frac{1}{3}\)
\(\Leftrightarrow x=\frac{1}{3}+\frac{3}{7}\)
\(\Leftrightarrow x=\frac{16}{21}\)
b) \(\frac{-5}{8}+x=\frac{-2^2}{3}\)
\(\Leftrightarrow x=\frac{-4}{3}+\frac{5}{8}\)
\(\Leftrightarrow x=-\frac{17}{24}\)
c) \(4\frac{1}{3}:\frac{x}{4}=6:0,3\)
\(\Leftrightarrow\frac{8}{3}:\frac{x}{4}=20\)
\(\Leftrightarrow\frac{32}{3x}=20\)
\(\Leftrightarrow3x=\frac{8}{5}\)
\(\Leftrightarrow x=\frac{8}{15}\)
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\(\frac{13}{3}:\frac{x}{4}=6:0,3\)
\(\frac{13}{3}:\frac{x}{4}=20\)
\(\frac{x}{4}=\frac{13}{3}:20\)
\(\frac{x}{4}=\frac{13}{3.20}\)
\(\frac{x}{4}=\frac{13}{60}\)
\(60x=13.4\)
\(60x=52\)
\(x=\frac{52}{60}\)
\(x=\frac{13}{15}\)
Vậy \(x=\frac{13}{15}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{1}{3}x:\frac{2}{3}=1\frac{3}{4}:\frac{2}{5}\)
\(\Rightarrow\frac{1}{3}x:\frac{2}{3}=\frac{35}{8}\)
\(\Rightarrow\frac{1}{3}x=\frac{35}{12}\)
\(\Rightarrow x=\frac{35}{4}\)
a) \(\left(\frac{1}{3}\cdot x\right):\frac{2}{3}=1\frac{3}{4}:\frac{2}{5}\)
\(=\left(\frac{1}{3}\cdot x\right):\frac{2}{3}=\frac{35}{8}\)
\(\Rightarrow\frac{1}{3}\cdot x=\frac{35}{8}\cdot\frac{2}{3}\)
\(\Rightarrow x=\frac{35}{12}:\frac{1}{3}=\frac{35}{4}\)
b) \(4,5:0,3=2,5:\left(0,1\cdot x\right)\)
\(=15=2,5:\left(0,1\cdot x\right)\)
\(\Rightarrow0,1\cdot x=2,25:15\)
\(\Rightarrow x=\frac{3}{20}:0,1=\frac{3}{2}=1,5\)
c) \(8:\left(\frac{1}{4}\cdot x\right)=2:0,02\)
\(8:\left(\frac{1}{4}\cdot x\right)=100\)
\(\Rightarrow\frac{1}{4}\cdot x=8:100\)
\(\Rightarrow x=\frac{2}{25}:\frac{1}{4}=\frac{8}{25}=0,32\)
d) \(3:2\frac{1}{4}=\frac{3}{4}:\left(6\cdot x\right)\)
\(=\frac{4}{3}=\frac{3}{4}:\left(6:x\right)\)
\(\Rightarrow6\cdot x=\frac{3}{4}:\frac{4}{3}\)
\(\Rightarrow x=\frac{9}{16}:6=\frac{3}{32}=0,09375\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Tìm x:
a)-23+0,5x=1,5
-8+0,5x = 1,5
0,5x = 1,5-(-8) = 9,5
x = 9,5:0,5 = 19
b)(−3)x81=−27
(-3)x:81 =-27
(-3)x = -27.81 = -2187
(-3)x = (-3)7
=> x=7
c)112.x−4=0,5
1,5.x = 0,5+4 = 4,5
x = 4,5:1,5 = 3
d)123:x4=6:0,3
\(\frac{5}{3}\):\(\frac{x}{4}\) = 20
\(\frac{x}{4}\) = \(\frac{5}{3}\):20 = \(\frac{1}{12}\)
=> x:4 = \(\frac{1}{12}\)
x = \(\frac{1}{12}\).4 = \(\frac{1}{3}\)
\(1\frac{2}{3}:\frac{x}{4}=6:0,3\)
\(\frac{5}{3}:\frac{x}{4}=20\)
\(\frac{x}{4}=\frac{5}{3}:20\)
\(\frac{x}{4}=\frac{1}{12}\)
\(\Rightarrow\frac{3x}{12}=\frac{1}{12}\)
\(\Rightarrow3x=1\)
\(\Rightarrow x=\frac{1}{3}\)
Vậy \(x=\frac{1}{3}\)