Question

(1,5 điểm) Tìm $x$.

a) $\dfrac{1}{2}-\dfrac{1}{2}: x=\dfrac{3}{4}$

b) $\dfrac{x-1}{15}=\dfrac{3}{5}$

c) $x+2,5=1,4$

Answer 1

a\()\)1/2-1/2:x=3/4

1/2:x=3/4+1/2

1/2:x=5/4

x=5/4*1/2

x=5/8

Answer 2

a,1/2:x=-1/4

x=1/2:-1/4

x=-2

b,Coi 3/5=-3/-5

x=-3+1=-2

c,x=-1,1

Answer 3

Answer 4

    

Answer 5

 

a)x=-2

b)=10

c)=-1,1

Answer 6

 

) 12−12:�=3421​−21​:x=43​

12:�=12−3421​:x=21​−43​

12:�=−1421​:x=4−1​

�=12: −14x=21​: 4−1​

$x=-2$

b) �−115=3515x−1​=53​

�−115=91515x−1​=159​

$x-1=9$

$x=10$

c) $x+2,5=1,4$

$x=1,4-2,5$

$x=-1,1$

12−12:�=34

Answer 7

a) \(\dfrac{1}{2}-\dfrac{1}{2}\) : x = \(\dfrac{3}{4}\)

            \(\dfrac{1}{2}\) : x = \(\dfrac{3}{4}-\dfrac{1}{2}\)

             \(\dfrac{1}{2}\) : x = \(\dfrac{1}{4}\)

                   x = \(\dfrac{1}{4}:\dfrac{1}{2}\) 

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

b) \(\dfrac{x-1}{15}=\dfrac{3}{5}\)

 

Answer 8

d

Answer 9

Answer 10

a,X=-2

b,X=10

c,X=1,1

Answer 11

    

Answer 12

a) x= 1/2-1/2

x= 0:3/4

x=0

b)

c) x=-01

Answer 13

 

Answer 14

a)1/2-1/2:x=3/4

          1/2:x=1/2-3/4

          1/2:x=-1/4

                x=1/2:(-1/4)

                x=-2

b)x-1/15=3/5

   x-1/15=9/15

   x-1=9

   x   =9+1

   x   =10

c)x+2,5=1,4

   x       =1,4-2,5

   x       =-1,1

Answer 15

Answer 16

Answer 17

a -2
b10
c-1,1

Answer 18

  

Answer 19

Answer 20

  

Answer 21

Answer 22

Answer 23

a)1/2-1/2:x=3/4

         1/2:x=1/2-3/4

         1/2:x=-1/4

               x=1/2:-1/4

               x=-2

b)x-1/15=3/5

  x-1/15=9/15

  x-1=9

  x   =9+1

  x=10

c)x+2,5=1,4

   x       =1,4-2,5

   x       =-1,1

Answer 24

Answer 25

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Answer 30