\(\left(4,5-2x\right).\frac{14}{7}=\frac{11}{4}\)

\(4,5-2x=\frac{11}{4}:\frac{14}{7}\)

\(4,5-2x=\frac{77}{56}\)

\(2x=\frac{77}{56}+4,5\)

\(2x=\frac{77}{56}+\frac{9}{2}\)

\(2x=\frac{329}{56}\)

a) 2/3 x = 2/9 + 4/9

=> 2/3 x = 2/3

=> x = 1

b) 4,5 - 2x = 11/14 + \(-1\frac{4}{7}\)

=> 4,5 - 2x = 5/14

=> 2x = 4,5 - 5/14

=> 2x = 29/7

=> x= 29/14

\(\left(2,8x-32\right)\div\frac{2}{3}=-90\)

\(\Rightarrow2,8x-32=-60\)

\(\Rightarrow2,8x=-28\)

\(\Rightarrow x=-10\)

\(\left(4,5-2x\right)\times1\frac{4}{7}=\frac{11}{14}\)

\(\Rightarrow4,5-2x=\frac{1}{2}\)

\(\Rightarrow2x=4\)

\(\Rightarrow x=2\)

\(\left(4,5-2.x\right).1\frac{4}{7}=\frac{11}{14}\)

\(\left(4,5-2.x\right).\frac{11}{7}=\frac{11}{14}\)

\(\left(4,5-2.x\right)=\frac{11}{14}:\frac{11}{7}\)

\(4,5-2.x=\frac{1}{2}\)

\(2.x=4,5-\frac{1}{2}\)

\(2.x=4\)

\(x=4:2=2\)

\(\left(4,5-2x\right)\cdot1\frac{4}{7}=\frac{11}{14}\)

\(\left(4,5-2x\right)\cdot\frac{11}{7}=\frac{11}{14}\)

\(4,5-2x=\frac{1}{2}\)

\(\frac{45}{10}-2x=\frac{1}{2}\)

\(2x=4\)

\(x=2\)

\(\left(4,5-2.x\right).\frac{11}{7}=\frac{11}{14}\)

\(\left(4,5-2.x\right)\)         =    \(\frac{11}{14}:\frac{11}{7}\)

\(\left(4,5-2.x\right)\)         =     \(\frac{1}{2}\)   

               \(2.x\)            =     \(4,5-\frac{1}{2}\)  

                \(2.x\)           =      \(4\)

                   \(x\)            =     \(4:2\)

                   \(x\)            =        \(2\)

tích nha

a) \(\left|x+3\right|:\left(-15\right)=\frac{1}{3}\)

\(\left|x+3\right|=-5\)

=> không tìm được x

b) \(\left|4,5-2x\right|.\left(-1\frac{4}{7}\right)=-\frac{11}{14}\)

\(\left|4,5-2x\right|=2\)

TH1: 4,5 - 2x = 2

2x = 2,5

x = 1,25

TH2: 4,5 - 2x = -2

2x = 6,5

x = 3,25

KL:...

\(a)x+30\%x=-1,31\)

\(\Leftrightarrow x+\frac{3x}{10}=-1,31\)

\(\Leftrightarrow10x+3x=-13,1\)

\(\Leftrightarrow13x=-13,1\Leftrightarrow x=-\frac{131}{130}\)

\(b)\left(x-\frac{1}{2}\right):\frac{1}{3}+\frac{5}{7}=9\frac{5}{7}\)

\(\Leftrightarrow\frac{2x-1}{2}.3+\frac{5}{7}=\frac{68}{7}\)

\(\Leftrightarrow\frac{6x-3}{2}=\frac{63}{7}\)

\(\Leftrightarrow\frac{6x-3}{2}=9\)

\(\Leftrightarrow6x-3=18\)

\(\Leftrightarrow x=\frac{7}{2}\)

\(c)\frac{1}{2}x-\frac{3}{4}=\frac{14}{9}.\frac{3}{7}\)

\(\Leftrightarrow\frac{x}{2}-\frac{3}{4}=\frac{2}{3}\)

\(\Leftrightarrow\frac{x}{2}=\frac{17}{12}\)

\(\Leftrightarrow12x=34\Leftrightarrow x=\frac{17}{6}\)

tham khảo

cái này đúng không nhỉ 

\(\Leftrightarrow4,5-2x=\dfrac{11}{14}:\dfrac{11}{7}\)

\(\Leftrightarrow4,5-2x=\dfrac{1}{2}\)

\(\Leftrightarrow2x=4,5-\dfrac{1}{2}\)

\(\Leftrightarrow x=4:2\)

\(\Leftrightarrow x=2\)

4,5 -2x = 11/14 : 1 4/7

4,5 -2x = 11/14 : 11/7

4,5 -2x =  1/2

2x = 4,5 - 1/2

2x = 4

x = 4 : 2

x = 2

(4,5 - 2\(x\)) (-1\(\dfrac{4}{7}\)) = \(\dfrac{11}{14}\)

(4,5 - 2\(x\)) (-\(\dfrac{11}{7}\)) = \(\dfrac{11}{14}\)

4,5 - 2\(x\) = \(\dfrac{11}{14}\) : ( - \(\dfrac{11}{7}\))

4,5 - 2\(x\) = \(\dfrac{11}{14}\) \(\times\) (- \(\dfrac{7}{11}\))

4,5 - 2\(x\) = - \(\dfrac{1}{2}\) 

4,5 - 2\(x\) = -0,5

2\(x\) = 4,5 + 0,5

2\(x\) = 5

\(x\) = 5: 2

\(x\) = 2,5