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\(a.\dfrac{12+x}{42}=\dfrac{35}{42}\Leftrightarrow12+x=35\Leftrightarrow x=23\)
\(b.\dfrac{25-x}{40}=\dfrac{3}{8}\Leftrightarrow\dfrac{25-x}{40}=\dfrac{15}{40}\Leftrightarrow25-x=15\Leftrightarrow x=10\)
\(c.\dfrac{13+x}{20}=\dfrac{3}{4}\Leftrightarrow\dfrac{13+x}{20}=\dfrac{15}{20}\Leftrightarrow13+x=15\Leftrightarrow x=2\)
\(d.\dfrac{23-x}{25}=\dfrac{20}{25}\Leftrightarrow23-x=20\Leftrightarrow x=3\)
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42 : X + 36 : X = 6
( 42 + 36 ) : X = 6
78 : X = 6
X = 78 : 6
X = 13
Kết bạn với mk nha !
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a) \(x\times15+x\times13=560\times45\)
\(\Rightarrow x\times\left(15+13\right)=25200\)
\(\Rightarrow x\times28=25200\)
\(\Rightarrow x=25200:28\)
\(\Rightarrow x=900\)
![](https://rs.olm.vn/images/avt/0.png?1311)
y x [ 13+ 45+ 42 ] =7300
y x 100 = 7300
y = 7300 : 100 dap an day nhe
y = 73
Ta có
42 : x + 16 : x = 13
(42 + 16) : x = 13
78 : x = 13
x = 78 : 13
x = 6
42:x+36:x=13
<=>(42+36):x=13
78:x=13
x=78:13=6