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

x=1,375

x=1,375

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

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

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

\(x=\left(-4\right):2=-2\)

`a)(4,5-2x)*1 4/7=11/14`

`=>(4,5-2x)*11/7=11/14`

`=>4,5-2x=1/2`

`=>2x=4,5-0,5=4`

`=>x=2`

Vậy `x=2`

`b)(2,8x-32):2/3=-90`

`=>2,8x-32=-90*2/3=-60`

`=>2,8x=-28`

`=>x=-10`

Vậy `x=-10`

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

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

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

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

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

\(2.x=4\)

\(x=4:2=2\)

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

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

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

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

\(2x=4\)

\(x=2\)

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

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

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

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

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

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

                   \(x\)            =        \(2\)

tích nha

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

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

         2.x             =  4,5 - 1/2 =4

             x  = 4:2=2

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

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

\(\Rightarrow4,5-2x=\frac{11}{14}:\frac{11}{7}\)

\(\Rightarrow4,5-2x=\frac{11}{14}.\frac{7}{11}\)

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

\(\Rightarrow2x=4,5-\frac{1}{2}\)

\(\Rightarrow2x=4,5-0,5\)

\(\Rightarrow2x=4\)

\(\Rightarrow x=4:2\)

\(\Rightarrow x=2\)

4,5 - 2x= 11/14 : 12/7

4,5 - 2x = 11/24

2x = 4,5 - 11/24

2x = 97/24

x = 97/24 : 2 

x = 97/48

a) x=-10

b)x=2

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

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

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

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

(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