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\(y:\dfrac{2}{3}=\dfrac{1}{3}+\dfrac{2}{3}\)
\(y:\dfrac{2}{3}=\dfrac{3}{3}=1\)
\(y=1\times\dfrac{2}{3}=\dfrac{2}{3}\)
Ta có: \(y:\dfrac{2}{3}=\dfrac{1}{3}+\dfrac{2}{3}\)
\(\Leftrightarrow y:\dfrac{2}{3}=1\)
\(\Leftrightarrow y=\dfrac{2}{3}\)
Vậy: \(y=\dfrac{2}{3}\)
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a) y × 2/5 + y × 3/5 = 5/7
y x ( 2/5 + 3/5) = 5/7
y x 5/5 = 5/7
y x 1 = 5/7
y = 5/7 : 1
y = 5/7
b) y × 7/2 - y × 3/2 = 3/4
y x ( 7/2 - 3/2) = 3/4
y x 4/2 = 3/4
y x 2 = 3/4
y = 3/4 : 2
y = 3/4 x 1/2
y = 3/8
`a,yxx(2/5+3/5)=5/7`
`y xx1=5/7`
`y=5/7:1`
`y=5/7`
`b,y xx(7/2-3/2)=3/4`
`y xx2=3/4`
`y =3/4:2`
`y=3/2`
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a) y = 5/14 : 6/7
y = 5/12
vậy y = 5/12
b) y = 4/9 x 2/3
y = 8/27
vậy t = 8/27
c) y = 1/2 - 3/10
y = 1/5
vậy y = 1/5
d) y = 5/6 - 1/3
y = 1/2
vậy y = 1/2
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3/5 x y + 1/2 : 5/3 - 5/4 = 1/2 x 1/3
3/5xy +3/10 -5/4 =1/6
3/5xy=1/6 -3/10+5/4=67/60
y= 67/60:3/5=67/36
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`y xx 1/2 + y xx 2/3 + y = 11/5`
`<=> y xx (1/2 + 2/3 +1)=11/5`
`<=> y xx 11/6 = 11/5`
`<=> y = 6/5`.
Vậy `y = 6/5`
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Hiệu x – y | 432 | 308 | 602 | 2000 | 2345 |
Tỉ số x : y | 4:1 | 2:1 | 6:3 | 5:3 | 7:2 |
x | 576 | 616 | 1206 | 5000 | 3283 |
y | 144 | 308 | 603 | 3000 | 938 |
\(2\times\dfrac{1}{3}:y=3\times\dfrac{1}{2}\\ \Rightarrow\dfrac{2}{3}:y=\dfrac{3}{2}\\ \Rightarrow y=\dfrac{3}{2}:\dfrac{2}{3}\\ \Rightarrow y=\dfrac{9}{4}\)