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y - 2005 : 5 = 214
y - 2005 = 214 x 5
y - 2005 = 1070
y = 1070 + 2005
y = 3075
y x 5 + 2014 = 15375 + 2014 = 17389
Chúc bạn học tốt!
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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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y*2+y*3+4*y+y=800*3
y * ( 2 + 3 + 4 + 1 ) = 800 * 3
y * 10 = 2400
y = 2400 : 10
y = 240
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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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a) \(y\times\dfrac{3}{4}=\dfrac{2}{5}\)
\(y=\dfrac{2}{5}:\dfrac{3}{4}\\ y=\dfrac{8}{15}\)
b) \(y:\dfrac{2}{3}-\dfrac{2}{5}=\dfrac{7}{8}\)
\(y:\dfrac{2}{3}=\dfrac{7}{8}+\dfrac{2}{5}\\ y:\dfrac{2}{3}=\dfrac{51}{40}\\ y=\dfrac{51}{40}\times\dfrac{2}{3}\\ y=\dfrac{17}{20}\)
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