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

4,5 - 2x= 7/4

2x=9/2 - 7/4

2x= 18/4-7/4

2x=11/4

x=11/4:2

x=11/8 

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

\(=\dfrac{99}{14}-\dfrac{22}{7}x+\dfrac{11}{14}\) 

\(=\left(\dfrac{99}{14}+\dfrac{11}{14}\right)-\dfrac{22}{7}x\) 

\(=\dfrac{55}{7}-\dfrac{22}{7}x\) 
\(=\dfrac{33}{7}+\dfrac{22}{7}.\left(1-x\right)\)

(4,5-2x) * -2=11/14

9/2-2x=11/14:-2

9/2-2x=-11/28

2x=9/2 - (-11/28)

2x=137/28

x=137/28:2

x=137/56

(4,5-2x) * -2=11/14

9/2-2x=11/14:-2

9/2-2x=-11/28

2x=9/2 - (-11/28)

2x=137/28

x=137/28:2

x=137/56

=127/56 nha bn

(4,5-2x) * -2=11/14

9/2-2x=11/14:-2

9/2-2x=-11/28

2x=9/2 - (-11/28)

2x=137/28

x=137/28:2

x=137/56

 NHA BAN 

(4,5-2x) * -2=11/14

9/2-2x=11/14:-2

9/2-2x=-11/28

2x=9/2 - (-11/28)

2x=137/28

x=137/28:2

x=137/56

(4,5-2x) * -2=11/14

9/2-2x=11/14:-2

9/2-2x=-11/28

2x=9/2 - (-11/28)

2x=137/28

x=137/28:2

x=137/56

Theo bài ra, ta có:

\(\left(4,5-2x\right).1\dfrac{4}{7}=\dfrac{11}{14}\\ \left(4,5-2x\right).\dfrac{11}{7}=\dfrac{11}{14}\\ 4,5-2x=\dfrac{11}{14}:\dfrac{11}{7}\\ 4,5-2x=\dfrac{1}{2}\\ 2x=4,5-\dfrac{1}{2}\\ \Rightarrow2x=4\\ \Rightarrow x=2\)

Vậy x = 2

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

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

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

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

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

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

\(\Leftrightarrow-2x=-4\)

\(\Leftrightarrow x=2\)

Vậy phương trình có ngiệm x = 2 .

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

=>2x=4

hay x=2

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

\(\left(\dfrac{9}{2}-2x\right)\cdot\dfrac{11}{7}=\dfrac{11}{14}\)

\(\dfrac{9}{2}-2x=\dfrac{11}{14}:\dfrac{11}{7}\)

\(\dfrac{9}{2}-2x=\dfrac{1}{2}\)

\(2x=\dfrac{9}{2}-\dfrac{1}{2}\)

\(2x=\dfrac{8}{2}\)

\(x=\dfrac{8}{2}:2\)

`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 

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

`a)-5/6-x=7/12+[-1]/3`

   `-5/6-x=1/4`

   `x=-5/6-1/4`

   `x=-13/12`

`b)(4,5-2x).(-1 4/7)=11/14`

   `(4,5-2x).(-11/7)=11/14`

    `4,5-2x=11/14:(-11/7)=-0,5`

    `2x=4,5-(-0,5)=5`

    `x=5:2=2,5`

`c)(2/11+1/3)x=(1/7-1/8).56`

   `17/33 x=1/56 .56=1`

      `x=33/17`