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a) \(\left(\dfrac{1}{4}x\right):3=\dfrac{5}{6}:\dfrac{1}{8}\\ \left(\dfrac{1}{4}x\right):3=\dfrac{20}{3}\\ \dfrac{1}{4}x=\dfrac{20.3}{3}\\ \dfrac{1}{4}x=20\\ x=80\)
a: Ta có: \(\dfrac{0.25x}{3}=\dfrac{5.6}{0.125}\)
\(\Leftrightarrow x\cdot\dfrac{1}{4}=134.4\)
hay x=537,6
b: Ta có: \(\dfrac{2.5}{7.5}=x:\dfrac{3}{5}\)
\(\Leftrightarrow x:\dfrac{3}{5}=\dfrac{1}{3}\)
hay \(x=\dfrac{1}{5}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
( 0,25 . x ) : 3 = 20/3
( 0,25 . x ) = 20/3 .3
( 0,25 . x ) = 20
x = 20 : 0,25
x = 80
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a, Ta có: 27/x = 9/14
27/x = 27/42
Vậy x = 42
b, 5/0,18 = 12,5/x
Suy ra 5.x = 0,18 . 12,5
5.x = 2,25
x = 2,25 : 5
x = 0,45 = 9/10
Vậy x = 9/10
c, 0,25x : 3 = 5/6 : 0,125
1/4x : 3 = 5/6 : 1/8
1/4x : 3 = 5/6 . 8
1/4x : 3 = 20/3
1/4x = 20/3 . 3
1/4x = 20
x = 20 : 1/4
x = 20 . 4
x = 80
Vậy x = 80
d, x/-15 = -60/x
Suy ra x . x= -15 . (-60)
x2 = 900
x2 = 302
Suy ra x=30
Vậy x = 30
Chúc bạn học tốt
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0,25x : 3 = \(\frac{5}{6}\) : 0,125
0,25x : 3 = \(\frac{5}{6}\): \(\frac{1}{8}\)
0,25x : 3 = \(\frac{20}{3}\)
0,25x = \(\frac{20}{3}\)x 3
0,25x = 20
x = 20 : 0,25
x = 80
![](https://rs.olm.vn/images/avt/0.png?1311)
(0,25x) : 3 = (5/6) : 0,125
⇔ (0,25x).0,125 = 3. (5/6)
⇔ (0,25x).0,125 = 2,5
⇔ 0,25x = 2,5 : 0,125
⇔ 0,25x = 20
⇔ x = 20 : 0,25 = 80
![](https://rs.olm.vn/images/avt/0.png?1311)
( 0,25x ) : 3 = 5/6 : 0,125
( 1/4x ) : 3 = 5/6 : 1/8
( 1/4x ) : 3 = 5/6 x 8
( 1/4x ) : 3 = 20/3
1/4x = 20/3 x 3
1/4x = 20
x = 20 : 1/4
x = 80
0,01 : 2,5 = ( 0,75x ) : 0,75
1/100 : 25/10 = (3/4x) : 3/4
1/100 x 10/25 = (3/4x) : 3/4
=>(3/4x) : 3/4 = 1/250
3/4x = 1/250 x 3/4
3/4x = 3/1000
x = 3/1000 : 3/4
x = 1/250
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(\left(0,25x\right):3=\frac{5}{6}:0,125\)
\(\Leftrightarrow0,25x=\frac{20}{3}.3\)
\(\Leftrightarrow x=80\)
b) \(0,01:2,5=\left(0,75x\right):0,75\)
\(\Leftrightarrow x=\frac{1}{250}\)
\(0,25x:3=\dfrac{5}{6}:0,125\\ \Rightarrow0,25x:3=\dfrac{5}{6}:\dfrac{1}{8}\\ \Rightarrow0,25x:3=\dfrac{20}{3}\\ \Rightarrow0,25x=\dfrac{20}{3}\times3\\ \Rightarrow0,25x=20\\ \Rightarrow x=20:0,25\\ \Rightarrow x=80\)
Vậy \(x=80\)
0,25x : 3 = \(\dfrac{20}{3}\)
0,25x = 20
x = \(\dfrac{20}{0,25}\)
x = 80