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\(154\)\(:\) \(x\)\(=\)\(38\)( dư 2 )
\(x\) \(=\) \(\left(154-2\right)\)\(:\)\(38\)
\(x\) \(=\) \(152\) \(:\)\(38\)
\(x\) \(=\) \(4\)
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2154 -(X+356) x 2=154 x 6
=2154 - (X+356) x 2=924
=2154 - ( X +356)=924:2
=2154 - (X + 356) =462
=X+356=2154 -462
=X+356=1692
=X=1692 - 356
=>X=1336
k mik nhé
![](https://rs.olm.vn/images/avt/0.png?1311)
y*aa=154*a
<=> y*a*11=154*a
<=> y*11=154
<=> y=154:11=14
=> a E N và y=14
y x aa = 154 x a
y x 11 x a = 154 x a
y x 11 = 154 (cùng bớt đi thừa số a)
y = 154 : 11
y = 14
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1) Ta có: \(\left(\dfrac{3}{4}\cdot\dfrac{5}{97}+\dfrac{1}{9}\cdot\dfrac{13}{47}\right)\cdot\left(\dfrac{1}{5}-\dfrac{7}{25}\cdot\dfrac{5}{7}\right)\)
\(=\left(\dfrac{3}{4}\cdot\dfrac{5}{97}+\dfrac{1}{9}\cdot\dfrac{13}{47}\right)\cdot\left(\dfrac{1}{5}-\dfrac{1}{5}\right)\)
=0
2) Ta có: \(\dfrac{8}{17}\cdot\dfrac{4}{15}+\dfrac{8}{17}\cdot\dfrac{22}{15}-\dfrac{8}{15}\cdot\dfrac{9}{17}\)
\(=\dfrac{8}{17}\left(\dfrac{4}{15}+\dfrac{22}{15}-\dfrac{9}{15}\right)\)
\(=\dfrac{8}{17}\cdot\dfrac{15}{15}=\dfrac{8}{17}\)
3) Ta có: \(\dfrac{2021}{2}\cdot\dfrac{1}{3}+\dfrac{4042}{4}\cdot\dfrac{1}{5}+\dfrac{6063}{3}\cdot\dfrac{22}{15}\)
\(=\dfrac{2021}{2}\left(\dfrac{1}{3}+\dfrac{1}{5}\right)+2021\cdot\dfrac{22}{15}\)
\(=\dfrac{2021}{2}\cdot\dfrac{8}{15}+\dfrac{2021}{2}\cdot\dfrac{44}{15}\)
\(=\dfrac{2021}{2}\cdot\dfrac{52}{15}\)
\(=\dfrac{52546}{15}\)
4) Ta có: \(\dfrac{4}{7}\cdot\dfrac{2}{13}+\dfrac{8}{13}:\dfrac{7}{4}+\dfrac{4}{7}:\dfrac{13}{2}+\dfrac{4}{7}\cdot\dfrac{1}{13}\)
\(=\dfrac{4}{7}\left(\dfrac{2}{13}+\dfrac{8}{13}+\dfrac{2}{13}+\dfrac{1}{13}\right)\)
\(=\dfrac{4}{7}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
145x2+4x154+3+154+154
=154x[2+4+3+1]
=154x10
+1540
=1540 nha cậu