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27 tháng 3 2016

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

3 tháng 4 2017

Pt \(\Leftrightarrow\dfrac{1}{2}x-\dfrac{2}{3}x=\dfrac{5}{12}\)
\(\Leftrightarrow x\left(\dfrac{1}{2}-\dfrac{2}{3}\right)=\dfrac{5}{12}\)
\(\Leftrightarrow-\dfrac{1}{6}.x=\dfrac{5}{12}\)
\(\Leftrightarrow x=-\dfrac{5}{2}\)

4 tháng 4 2017

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 = \(\dfrac{-5}{2}\)

\(0,5x-\frac{2}{3}x=\frac{5}{2}\)

\(\Rightarrow\frac{1}{2}x-\frac{2}{3}x=\frac{5}{2}\)

\(\Rightarrow x\left(\frac{1}{2}-\frac{2}{3}\right)=\frac{5}{2}\)

\(\Rightarrow x\frac{-1}{6}=\frac{5}{2}\)

\(\Rightarrow x=\frac{5}{2}:\frac{-1}{6}=-15\)

13 tháng 4 2018

\(\text{a)}25\%-\frac{3}{2}+0,5.\frac{12}{5}\)

\(=\frac{1}{4}-\frac{3}{2}+\frac{1}{2}.\frac{12}{5}\)

\(=-\frac{5}{8}+\frac{6}{5}\)

\(=-\frac{25}{40}+\frac{48}{40}\)

\(=\frac{23}{40}\)

\(b)0,25.\frac{7}{3}.30.\text{ }0,5.\frac{8}{45}\)

\(=\frac{1}{4}.\frac{7}{3}.30.\frac{1}{2}.\frac{8}{45}\)

\(=\frac{7}{12}.(30.\frac{8}{90})\)

\(=\frac{7}{12}.\frac{8}{3}\)

\(=\frac{14}{9}\)

\(c)\frac{9}{23}.\frac{5}{8}+\frac{9}{23}.\frac{3}{8}-\frac{9}{23}\)

\(=\frac{9}{23}.\left(\frac{5}{8}+\frac{3}{8}-1\right)\)

\(=\frac{9}{23}.0\)

\(=0\)

29 tháng 3 2016

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

8 tháng 8 2018

a) \(\dfrac{1}{4}+\dfrac{\dfrac{3}{4}}{3x}=-5\)

\(\dfrac{\dfrac{3}{4}}{3x}=-5-\dfrac{1}{4}\)

\(\dfrac{\dfrac{3}{4}}{3x}=-\dfrac{21}{4}\)

\(3x=\dfrac{\dfrac{3}{4}}{-\dfrac{21}{4}}\)

\(3x=-\dfrac{1}{7}\)

\(x=\dfrac{-\dfrac{1}{7}}{3}\)

\(x=-\dfrac{1}{21}\)

7 tháng 8 2018

a) 1/4 + 3/4 : 3x = -5

3/4 : 3x = -5 - 1/4

3/4 : 3x = -21/4

3x = 3/4: -21/4

3x = 1/-7

x = 1/-7 : 3

x = 1/-21

b) x - 25%x = 0,5

1.x - 1/4 . x = 1/2

(1 - 1/4) . x = 1/2

3/4 . x = 1/2

x = 1/2 : 3/4

x = 1/2 . 4/3

x = 2/3