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a) x + 1/15 = 1/3 - 1/4 = 4/12 - 3/12 = 1/12.
=> x = 1/12 - 1/15 = 5/60 - 4/60 = 1/60.
b) x - 5/12 = 1/3 + 1/4 = 4/12 + 3/12 = 7/12.
=> x = 7/12 + 5/12 = 1
c) x x 2/7 = 3/4 x 4/15 = 1/5
=> x = 1/5 : 2/7 = 1/5 x 7/2 = 7/10
d) x : 3/8 = 4/3 : 3/6 = 4/3 x 2 = 8/3
=> x = 8/3 x 3/8 = 1
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Bài giải
\(\left(\frac{1}{4}\text{ x }x-\frac{1}{8}\right)\text{ x }\frac{3}{4}=\frac{1}{4}\)
\(\left(\frac{1}{4}\text{ x }x-\frac{1}{8}\right)=\frac{1}{4}\text{ : }\frac{3}{4}\)
\(\frac{1}{4}\text{ x }x-\frac{1}{8}=\frac{1}{3}\)
\(\frac{1}{4}\text{ x }x=\frac{1}{3}+\frac{1}{8}\)
\(\frac{1}{4}\text{ x }x=\frac{11}{24}\)
\(x=\frac{11}{24}\text{ : }\frac{1}{4}=\frac{11}{24}\text{ x }4\)
\(x=\frac{11}{6}\)
\(\left(\frac{1}{4}\times a-\frac{1}{8}\right)\times\frac{3}{4}=\frac{1}{4}\)
\(\Rightarrow\frac{1}{4}\times a-\frac{1}{8}=\frac{1}{4}:\frac{3}{4}\)
\(\Rightarrow\frac{1}{4}\times a-\frac{1}{8}=\frac{1}{3}\)
\(\Rightarrow\frac{1}{4}\times a=\frac{1}{3}+\frac{1}{8}\)
\(\Rightarrow\frac{1}{4}\times a=\frac{11}{24}\)
\(\Rightarrow a=\frac{11}{24}:\frac{1}{4}\)
\(\Rightarrow a=\frac{11}{6}\)
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a) 4/7 x X = 1/5 + 2/3
=> 4/7 x X = 3/15 + 10/15
=> 4/7 x X = 13/15
=> X = 13/15 : 4/7
=> X = 13/15 x 4/7 = 52/105
a ) 4 / 7 x X = 1 / 5 + 2 / 3
= > 4 / 7 x X = 3 / 1 5 + 1 0 / 1 5
= > 4 / 7 x X = 1 3 / 1 5
= > X = 1 3 / 1 5 : 4 / 7
= > X = 1 3 / 1 5 x 4 / 7
= 5 2 / 1 0 5
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`3/4 : x =1 1/2`
`=> 3/4 : x= 3/2`
`=>x= 3/4 : 3/2`
`=>x= 3/4 xx 2/3`
`=> x= 6/12`
`=> x= 1/2`
Vậy `x=1/2`
Thay `5/8-x` thì
`5/8-1/2= 5/8- 4/8=1/8`
\(\dfrac{3}{4}:x=1\dfrac{1}{2}\)
\(\dfrac{3}{4}:x=\dfrac{3}{2}\)
\(x=\dfrac{3}{4}:\dfrac{3}{2}\)
\(x=\dfrac{1}{2}\)
Vậy: \(\dfrac{5}{8}-x=\dfrac{5}{8}-\dfrac{1}{2}=\dfrac{1}{8}\)
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(1/4 x X - 1/8) x 3/4 = 1/4
(1/4 x X - 1/8) = 1/4 : 3/4
(1/4 x X - 1/8) = 1/3
1/4 x X = 1/3+1/8
1/4 x X = 11/24
X = 11/24 : 1/4
X = 11/6
(1/4xX-1/8)x3/4=1/4
1/4xX-1/8=1/4:3/4
1/4xX-1/8=1/3
1/4xX=1/3+1/8
1/4xX=11/24
X=11/24:1/4
X=11/6
= \(\frac{11}{6}\)
(1/4 * x - 1/8) * 3/4 = 1/4
=> 1/4 * x - 1/8 = 1/4 : 3/4
=> 1/4 * x - 1/8 = 1/3
=> 1/4 * x = 1/3 + 1/8
=> 1/4 * x = 11/24
=> x = 11/24 : 1/4
=> x = 11/6