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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`
y x 3 + y : 2 = 110
y x 3 + y x 0,5 = 110
y x ( 3 + 0,5 ) = 110
y x 3,5 = 110
y = 110 : 3,5
y = ??????????
7/4-y x 5/6 = 1/2+1/3
7/4-y x 5/6=5/6
y x 5/6=7/4-5/6
y x 5/6=11/12
y=11/12 : 5/6
y=11/10
\(\frac{7}{4}-y\times\frac{5}{6}=\frac{1}{2}+\frac{1}{3}\)
\(\frac{7}{4}-y\times\frac{5}{6}=\frac{5}{6}\)
\(\frac{7}{4}-y=\frac{5}{6}\div\frac{5}{6}\)
\(\frac{7}{4}-y=1\)
\(y=1+\frac{7}{4}\)
\(y=\frac{11}{4}\)
9/4 - y × 5/6 = 1/2 + 1/3
9/4 - y × 5/6 = 5/6
y × 5/6 = 9/4 - 5/6
y × 5/6 = 17/12
y = 17/12 : 5/6
y = 17/10
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
...........................
bn ơi là 1\(\frac{1}{2}\)