Question

a) 2x+27= -11

b)3x+26= 6

c) x:  4    một phần hai=2,5

 đ)3 phần 4 x=1 phần 2     

Answer 1

a, 2x + 27 = -11

=> 2x = -11 - 27

=> 2x = -38

=> x = -38 : 2

=> x = -19

vậy___

b, 3x + 26 = 6

=> 3x = 6 - 26

=> 3x = -20

=> x = -20/3

vậy___

c, \(x\div4\frac{1}{2}=2,5\)

\(\Rightarrow x\div4,5=2,5\)

\(\Rightarrow x=4,5\cdot2,5\)

\(\Rightarrow x=11,25\)

vậy___

\(\frac{3}{4x}=\frac{1}{2}\)    đk: x khác 0

\(\Rightarrow\frac{3}{4x}=\frac{3}{6}\)

=> 4x = 6

=> x = 4/6 = 2/3

vậy___

Answer 2

a)  2x + 27 = -11

      2x  =  -11  - 27 =-28

=>   \(x=-\frac{28}{2}=-14\)

B)  3x + 26 = 6

     3x   = 6 - 26  = -20

     \(x=-\frac{20}{3}\)

C)  ko rõ đề

D)  \(\frac{3}{4x}=\frac{1}{2}\)

  \(3\cdot2=4x\)

   6= 4x  

=>  x  = \(\frac{6}{4}=\frac{3}{2}\)

hok tốt .

Answer 3

a) 2x + 27 = -11

=> 2x        = -11 - 27

=> 2x        = -38

=> x          = -38 : 2

=> x          = -19

b) 3x + 26 = 6

=> 3x        = 6 - 26

=> 3x        = -20

=> x          = \(\frac{-20}{3}\)

c) x : \(4\frac{1}{2}\)= 2,5

=> x : \(\frac{9}{2}\)= \(\frac{5}{2}\)

=> x             = \(\frac{5}{2}.\frac{9}{2}\)

=> x             = \(\frac{45}{4}\)

d) \(\frac{3}{4}x=\frac{1}{2}\)

=> x = \(\frac{1}{2}:\frac{3}{4}\)

=> x = \(\frac{1}{2}.\frac{4}{3}\)

=> x = \(\frac{2}{3}\)

Answer 4

a ) 2x + 27 = - 11

2x = - 11 - 27

2x = - 38

x = ( - 38 ) : 2

x = - 19

Vậy x = - 17

b ) 3x + 26 = 6

3x = 6 - 26

3x = - 20

x = ( - 20 ) : 3

x = \(\frac{-20}{3}\)

Answer 5

a) 2x + 27 = -11

\(\Rightarrow\)2x = -11 - 27 = -38

\(\Rightarrow\)x = -38 : 2 = -19

vậy .........

Answer 6

a , 2x + 27 = - 11 

2x = - 11 - 27

2x = - 38

x = - 38 : 2  

x = - 19

 b , 3x + 26 = 6

3x = 6 - 26

3x = 20

x = 20 : 3

x = 20 / 3

c , x : 4 / 1 / 2 = 2.5

x : 9/2 = 5/2

x = 5 /2 x 9 /2

x = 45/4

d , 3 / 4 x = 1/2

x = 1/2 : 3/4

x = 2/3