Question

Tìm x biết:

a) (5x-2)-(x+6)=0

b) (2x-3)-(3x+1)=4

Answer 1

Vì (5x-2) - ( x+6)=0

=> 5x-2 = x+6

=> 5x - x = 6+2

=> 4x = 8

=> x=8:4=2

Answer 2

a) (5x-2)-(x+6)=

   5x-2-x-6=0

   4x-8=0

   4x=8

x=2

b) (2x-3)-(3x+1)=4

    2x-3-3x-1=4

   -4-x=4

x=-4-4

x=-8

nếu thấy đúng thì k cho mh nah

Answer 3

a) (5x-2) - ( x+6)=0

=> 5x-2 = x+6

=> 5x - x = 6+2

=> 4x = 8

=> x=8:4=2

b) (2x-3)-(3x+1)=4

<=>2x - 3 - 3x - 1 = 4

<=> - x - 4 = 4

<=> -x = 4+4=8

<=>x=8

Answer 4

a) (5x-2)-(x+6)=0

để (5x-2)-(x+6)=0 thì 5x-2=x+6

=>5x=x+6+2

=>5x=x+8

=>4x=8

=>x=8:4=2

b) (2x-3)-(3x+1)=4

=>2x-3-3x-1=4

=>-x-3-1=4

=>-x-4=4

=>-x=4+4=8

=>x=-8

Answer 5

a. 5x-2 = 0 \(\Rightarrow\) 5x = - 2 \(\Rightarrow\) x= \(\frac{-2}{5}\)

   - x-6 = 0 \(\Rightarrow\) -x = 0+6 \(\Rightarrow\) -x = 6

vậy x = \(\frac{-2}{5}\)và x=- 6

b.(2x-3)-(3x+1)=4

\(\Leftrightarrow\) 2x - 3 - 3x + 1 = 4

\(\Leftrightarrow\) 2x- 3x = 3-1+4

\(\Leftrightarrow\) -x = 6

\(\Leftrightarrow\) x = -6

vậy x = - 6

Answer 6

câu b x=-8 đó nhá