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0,5.x-2/3.x=5/12
(0,5-2/3).x =5/12
(-1/6).x =5/12
x =5/12:(-1/6)
x =-5/2
Vậy x=-5/2
![](https://rs.olm.vn/images/avt/0.png?1311)
Pt \(\Leftrightarrow\dfrac{1}{2}x-\dfrac{2}{3}x=\dfrac{5}{12}\)
\(\Leftrightarrow x\left(\dfrac{1}{2}-\dfrac{2}{3}\right)=\dfrac{5}{12}\)
\(\Leftrightarrow-\dfrac{1}{6}.x=\dfrac{5}{12}\)
\(\Leftrightarrow x=-\dfrac{5}{2}\)
0,5.x-\(\dfrac{2}{3}\).x=\(\dfrac{5}{12}\)
\(\Leftrightarrow\)\(\dfrac{1}{2}\).x-\(\dfrac{2}{3}\).x=\(\dfrac{5}{12}\)
\(\Leftrightarrow\)x.(\(\dfrac{1}{2}\)-\(\dfrac{2}{3}\))=\(\dfrac{5}{12}\)
\(\Leftrightarrow\)x.\(\dfrac{-1}{6}\) =\(\dfrac{5}{12}\)
\(\Leftrightarrow\)x =\(\dfrac{5}{12}\):\(\dfrac{-1}{6}\)
\(\Leftrightarrow\)x =\(\dfrac{5}{12}\).\(\dfrac{-6}{1}\)
\(\Leftrightarrow\)x = \(\dfrac{-5}{2}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a.x+\dfrac{1}{6}=-\dfrac{3}{8}\)
\(\Leftrightarrow x=-\dfrac{13}{24}\)
\(b.2-\left(\dfrac{3}{4}-x\right)=\dfrac{7}{12}\)
\(\Leftrightarrow2-\dfrac{3}{4}+x=\dfrac{7}{12}\)
\(\Leftrightarrow x=-\dfrac{2}{3}\)
\(c.\dfrac{1}{2}x+\dfrac{1}{8}x=\dfrac{3}{4}\)
\(\Leftrightarrow\dfrac{5}{8}x=\dfrac{3}{4}\)
\(\Leftrightarrow x=\dfrac{6}{5}\)
\(d.75\%-1\dfrac{1}{2}+0,5:\dfrac{5}{12}-\left(\dfrac{-1}{2}\right)^2\)
\(=\dfrac{75}{100}-\dfrac{3}{2}+\dfrac{1}{2}:\dfrac{5}{12}-\dfrac{1}{4}\)
\(=-\dfrac{3}{4}+\dfrac{6}{5}-\dfrac{1}{4}\)
\(=\dfrac{1}{5}\)
a) \(x+\dfrac{1}{6}=\dfrac{-3}{8}\)
\(x=\dfrac{-3}{8}-\dfrac{1}{6}\)
\(x=\dfrac{-13}{24}\)
vậy x =....
b) \(2-\left(\dfrac{3}{4}-x\right)=\dfrac{7}{12}\)
\(\dfrac{3}{4}-x=2-\dfrac{7}{12}\)
\(\dfrac{3}{4}-x=\dfrac{17}{12}\)
\(x=\dfrac{3}{4}-\dfrac{17}{12}\)
\(x=\dfrac{-2}{3}\)
vậy x =....
![](https://rs.olm.vn/images/avt/0.png?1311)
\(0,5x-\frac{2}{3}x=\frac{5}{2}\)
\(\Rightarrow\frac{1}{2}x-\frac{2}{3}x=\frac{5}{2}\)
\(\Rightarrow x\left(\frac{1}{2}-\frac{2}{3}\right)=\frac{5}{2}\)
\(\Rightarrow x\frac{-1}{6}=\frac{5}{2}\)
\(\Rightarrow x=\frac{5}{2}:\frac{-1}{6}=-15\)
![](https://rs.olm.vn/images/avt/0.png?1311)
1/2x - 2/3x = 7/12
(1/2 - 2/3)x = 7/12
1/10x = 7/12
x = 7/12 : 1/10
x = 35/6
![](https://rs.olm.vn/images/avt/0.png?1311)
a. c1:15x12-3x3x10 = 180-150=30
c2: 15x12-15x10 = 15x(12-10) = 15x2 = 30
b. c1: 45-9x18=45-162=-117
c2: 45-9x13-9x5=45-45-9x13=-117
c. c1: 29x6-19x16=174-304=-130
c2: 29x19-29x13-19x29+19x13=13x(19-29)=13x(-10)=-130
a.
Cách 1:
15.12 - 3.5.10
= 180 - 150
= 30
Cách 2:
15.12 - 3.5.10
= 15 .12 - 15.10
= 15. ( 12 -10)
= 15.2
= 30
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