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Bài làm
\(\left(x-\frac{2}{3}\right)\times3=\frac{3}{4}\)
\(x-\frac{2}{3}=\frac{3}{4}\div3\)
\(x-\frac{2}{3}=\frac{3}{4}\times\frac{1}{3}\)
\(x-\frac{2}{3}=\frac{1}{4}\)
\(x=\frac{1}{4}+\frac{2}{3}\)
\(x=\frac{3}{12}+\frac{8}{12}\)
\(x=\frac{11}{12}\)
Vậy \(x=\frac{11}{12}\)
# Chúc các em học tốt #
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a/ \(\frac{x}{2}+\frac{x}{3}+\frac{x}{4}=180\)
\(\Leftrightarrow x\left(\frac{1}{2}+\frac{1}{3}+\frac{1}{4}\right)=180\)
\(\Leftrightarrow\frac{13}{12}x=180\)
\(\Leftrightarrow x=\frac{2160}{13}\)
b/ \(\frac{1}{x.2}+\frac{2}{x.3}+\frac{3}{x.4}=120\)
\(\Leftrightarrow\frac{1}{x}\left(\frac{1}{2}+\frac{2}{3}+\frac{3}{4}\right)=120\)
\(\Leftrightarrow\frac{1}{x}.\frac{23}{12}=120\)
\(\Leftrightarrow\frac{1}{x}=\frac{1440}{23}\)
\(\Leftrightarrow x=\frac{23}{1440}\)
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A = 3 x 3 x 3 x ... x 3 (2016 thừa số 3)
Do 3 x 3 = 9 chia 4 dư 1 => 3 x 3 x 3 x ... x 3 (có chẵn thừa số 3) chia 4 dư 1
=> A = 3 x 3 x 3 x ... x 3 (2016 thừa số 3) chia 4 dư 1
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left(\frac{13}{4}-y\cdot2\right)\cdot3=4\)
\(\frac{13}{4}-y\cdot2=\frac{4}{3}\)
\(y\cdot2=\frac{13}{4}-\frac{4}{3}\)
\(y\cdot2=\frac{39}{12}-\frac{16}{12}\)
\(y\cdot2=\frac{23}{12}\)
\(y=\frac{23}{12}:2\)
\(y=\frac{23}{12}\cdot\frac{1}{2}\)
\(y=\frac{23}{24}\)
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\(2\frac{4}{5}\)+3:\(\frac{3}{8}\)
=14/5+3*8/3
=14/5+8
=54/5
2>
x + 6/7=1/2*3
x+6/7=3/2
x=3/2-6/7
x=21/14-12/14
x=9/14
vậy x=9/14
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\(\left(x-\frac{2}{3}\right).3=\frac{3}{4}\)
\(\left(x-\frac{2}{3}\right)=\frac{3}{4}:3\)
\(x-\frac{2}{3}=\frac{1}{4}\)
\(x=\frac{1}{4}+\frac{2}{3}\)
\(x=\frac{11}{12}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
-\(\left(x-\frac{2}{3}\right).3=\frac{3}{4}\)
-\(\left(x-\frac{2}{3}\right)=\frac{3}{4}:3\)
-\(x-\frac{2}{3}=\frac{1}{4}\)
\(-x=\frac{1}{4}+\frac{2}{3}\)
\(-x=\frac{11}{12}\)
\(=>x=-\frac{11}{12}\)
<br class="Apple-interchange-newline"><div id="inner-editor"></div>(x−23 ).3=34
-(x−23 )=34 :3
-x−23 =14
−x=14 +23
−x=1112
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{3}{4}\times\frac{4}{7}+\frac{3}{7}\times\frac{3}{2}\)
\(=\frac{3}{7}+\frac{9}{14}=\frac{15}{14}\)
\(X+\frac{31}{2}+X=24\frac{1}{4}\)
\(\Rightarrow2x+\frac{31}{2}=24\frac{1}{4}\)
\(\Rightarrow2x=24\frac{1}{4}-\frac{31}{2}\)
\(\Rightarrow2x=\frac{35}{4}\)
\(\Rightarrow x=\frac{35}{4}:2=\frac{35}{8}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\dfrac{22}{5}\times\dfrac{6}{121}\times\dfrac{11}{4}\times\dfrac{3}{5}\times\dfrac{1}{3}\times\dfrac{5}{4}\)
\(=\left(\dfrac{22}{5}\times\dfrac{5}{4}\right)\times\left(\dfrac{6}{121}\times\dfrac{11}{4}\right)\times\left(\dfrac{3}{5}\times\dfrac{1}{3}\right)\)
\(=\dfrac{11}{2}\times\dfrac{3}{22}\times\dfrac{1}{5}\)
\(=\dfrac{3}{20}\)
\(=\dfrac{22\times6\times11\times3\times1\times5}{5\times121\times4\times5\times3\times4}=\dfrac{11\times2\times6\times11\times1}{11\times11\times4\times5\times4}=\dfrac{2\times6\times1}{4\times5\times4}=\dfrac{18}{100}=\dfrac{9}{50}\)
( x - 2/3) x 3 = 3/4
x - 2/3 = 3/4: 3
x - 2/3 = 1/4
x = 1/4 + 2/3
x = 11/12