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` a/`
` 3 1/5 : 2 1/3 : y = 12/7 `
` 48/35 : y = 12/7 `
` y = 48/35 : 12/7 `
` y = 48/35 xx 7/12 `
` y = 4/5`
Vậy ` y = 4/5`
`b/`
` 3 : y xx 3 1/2 = 2/3 xx 3/4 `
` 3 : y xx 7/2 = 1/2`
` 3 : y = 1/2 : 7/2 `
` 3 : y = 1/2 xx 2/7 `
` 3 : y = 1/7 `
` y = 3 : 1/7 `
` y = 3 xx 7`
` y = 21 `
Vậy ` y = 21 `
`c/`
` 3 2/3 - y + 1 3/4 = 2`
` 11/3 - y + 7/4 = 2 `
` 11/3 -y = 2 - 7/4`
` 11/3 - y = 1/4 `
` y = 11/3 - 1/4 `
` y = 41/12 `
Vậy ` y = 41/12`
yx3+y/2+y/4=11/2:y
yx3+y:2+y:4=5,5:y
yx3+y:(2+4)=5.5:y
yx3+y:6=5,5:y
yx3+yx1/6=5,5:y
yx(3+1/6)=5,5:y
yx19/6=5,5:y
...........................
\(y\times3+y\times4+y:3+y:4=182\\ y\times3+y\times4+y\times\dfrac{1}{3}+y\times\dfrac{1}{4}=182\\ y\times\left(3+4+\dfrac{1}{3}+\dfrac{1}{4}\right)=182\\ y\times\dfrac{91}{12}=182\\ y=182:\dfrac{91}{12}\\ y=24\)
`yxx3+yxx4+y:3+y:4=182`
`yxx3+yxx4+yx 1/3+yx1/4=182`
`yxx(3+4+1/3+1/4)=182`
`yxx 91/12=182`
`y=182: 91/12`
`y=182xx12/91`
`y=24`
Vậy `y=24`
219,1 + y:y < y \(\times\) 2 + y \(\times\) 4 - y < 230,2 - y + y
219,1 + 1 < y \(\times\) 2 + y \(\times\) 4 - y \(\times\) 1 < 230,2 - ( y - y)
210,1 < y \(\times\) ( 2 + 4 - 1) < 230,2
210,1 < y \(\times\) 5 < 230,2
210,1 : 5 < y < 230,2: 5
42,02 < y < 46,04
X-Yx3=Yx3+4,25
X-Yx3-Yx3=4,25
X-Yx(3-3)=4,25
X-Yx0=4,25
=> X=4,25
4,25-Y=2,25
Y=4,25-2,25
Y=2
Bai nay sao de vay?
x=y+2.25
<=> y+2.25 - 3y=3y+4.25
<=> 5y=-2
y=-0.4
x=1.85 bai nay ra am nha
a) (y - 24) : 28 = 20
y - 24 = 20 x 28
y - 24 = 560
y = 560 + 24
y = 584
vậy y = ...
a.
\(\left(y-24\right):28=20\)
\(\left(y-24\right)=560\)
\(y=584\)
b. \(13\times\left(y-6\right)=4\times y-6\)
\(13\times y-78=4\times y-6\)
\(9\times y=72\)
\(y=8\)
c.\(y\times3+y\times4+y:3+y:4=182\)
\(y\times\left(3+4\right)+y:\left(3+4\right)=182\)
\(y\times\left(7+\dfrac{1}{7}\right)=182\)
\(y=\dfrac{637}{25}\)
\(y\text{×}5+y:0,25=81\)
\(y\text{×}5+y\text{×}4=81\)
\(y\text{×}\left(5+4\right)=81\)
\(y\text{×}9=81\)
\(y=81:9\)
\(y=9\)
\(y\text{×}3+y:0,2=64\)
\(y\text{×}3+y\text{×}5=64\)
\(y\text{×}\left(3+5\right)=64\)
\(y\text{×}8=64\)
\(y=64:8\)
\(y=8\)
`y xx 3 + y xx 4 + y : 3 + y : 4 = 182`
`y xx (3 + 4) + y : (3 + 4) = 182`
`y xx 7 + y : 7 = 182`
Tự làm nốt