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y : ( 2 + 1 + 3 + 4) = 25
y : 10 = 25
y = 25 x 10
y = 250
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y : 2 + y + y : 3 + y : 4 = 25
1/2 * y + y + 1/3 * y + 1/4 * y = 25
y * (1/2 + 1/3 + 1/4 + 1) = 25
y * 25/12 = 25
y = 25 : 25/12 = 25 * 12/25
y = 12
y = 12
Thử lại :
12 : 2 + 12 + 12 : 3 + 12 : 4 = 25
6 + 12 +4 +3 = 25
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y : 2 + y + y : 3 + y : 4 = 25
y : 2 + y : 1 + y : 3 + y : 4 = 25
y : ( 2 + 1 + 3 + 4 ) = 25
y : 10 = 25
y = 25 x 10
y = 250
\(y:2+y+y:3+y:4=25\Rightarrow y\times\frac{1}{2}+y+y\times\frac{1}{3}\)\(+y\times\frac{1}{4}=25\)
\(\Rightarrow y\times\left(\frac{1}{2}+1+\frac{1}{3}+\frac{1}{4}\right)=25\Rightarrow y\times\frac{25}{12}=25\Rightarrow y=25:\frac{25}{12}\Rightarrow y=12\)
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y:3 = y x 1/3
y:4=y x 1/4
y + y x 1/3 + y x 1/4 + 2 =25
=> 19/12 y + 2 = 25
19/12 y = 23
=> y = 23 x 12/19
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\(y+y.\frac{1}{3}.\frac{9}{2}+y.\frac{7}{2}=25\)
\(y+y.6+y.\frac{7}{2}=25\)
\(y.\left(1+6+\frac{7}{2}\right)=25\)
\(y.\frac{21}{2}=25\)
\(y=25:\frac{21}{2}\)
\(y=25.\frac{2}{21}\)
\(y=\frac{50}{21}\)
\(y.5+y.3+y+y=50\)
\(y.\left(5+3+1+1\right)=50\)
\(y.10=50\)
\(y=5\)
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\(\text{y : 2 + y + y : 3 + y : 4 = 25}\)
\(\text{1/2 .y + y + 1/3 . y + 1/4 . y = 25}\)
\(\text{y . (1/2 + 1/3 + 1/4 + 1) = 25}\)
\(\text{y . 25/12 = 25}\)
\(\text{y = 25 : 25/12 = 25 . 12/25}\)
\(\text{y = 12 }\)
Vậy \(y=12\)
\(y:2+y+y:3+y:4=25\\ y:\left(2+3+1+4\right)=25\\ y:10=25\\ y=25x10\\ y=250.\)