Question

odgadnij niewiadomą x i napisz sprawdzenie!:

2(x+3)=18

5x-2(x+3)=9

2(x+1)+5x=16

x+3(x-2)=(-22)

4(2x+3)-5x=(-3)

-4x-3(2x+1)=7

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POMÓŻCIE BO JA Z TEGO TO ANI ME ANI BE

Answer 1

2(x+3) = 18

2x +6 = 18

2x = 18 -6

2x = 12/;2

  x = 6

 

Spr.

L = 2(6+3)= 2*9=18

P = 18

L = P

 

 

5x -2(x+3)= 9

5x -2x -6 = 9

5x -2x = 9 +6

3x = 15 /:3

x = 5

 

Spr.

L= 5*5-2(5+3)= 25 -2*8)= 25 -16 = 9

P = 9

L = P

 

2(x+1)+5x = 16

2x +2 +5x =16

2x +5x = 16 -2

 7x = 14 /:7

   x  = 2

 

Spr.

L= 2(2+1) +5*2 = 2*3 +10= 6 +10 = 16

P = 16

L= P

 

 

x+3(x-2)  =(-22)

x+3x-6 = -22

x +3x  = -22 +6

  4x = -16/:4

   x = -4

 

Spr.

L= -4+3(-4 -2) = -4+ 3*(-6) = -4 -18 = -22

P = -22

L = P

 

 

4(2x+3) -5x = (-3)

8x +12 -5x = -3

8x -5x = -3 -12

  3x = -15 /: 3

    x = -5

 

Spr.

L= 4(2*(-5) +3) -5*(-5) = 4*(-7) +25 = -28 +25 = -3

P = -3

L = P

 

 

-4x -3(2x+1) =7

-4x -6x -3 = 7

-4x -6x = 7 +3

- 10x = 10 / :(-10)

     x = -1

 

Spr.

L= -4*(-1) -3(2*(-1) +1) = 4 -3*(-1) = 4  + 3 = 7

P = 7

L = P

Answer 2

2(x+3)=18

2x+6=18

2x=18-6

2x=12/2

x=6

2(6+3)=18

2*9=18

18=18

 

5x-2(x+3)=9

5x-2x-6=9

3x=9+6

3x=15/3

x=5

25-2(5+3)=9

25-10-6=9

9=9

 

2(x+1)+5x=16

2x+2+5x=16

7x=16-2

7x=14/7

x=2

2*(2+1)+5*2=16

4+2+10=16

16=16

 

x+3(x-2)=-22

x+3x-6=-22

4x=-22+6

4x=-16/4

x=-4

(-4)+3*(-4-2)=-22

(-4)+3*(-6)=-22

(-4)-18+-22

-22=-22

 

4(2x+3)-5x=-3

8x+12-5x=-3

3x=-3-12

x=-15/3

x=-5

4*[2*(-5)+3]-5*(-5)=-3

4*[-10+3]+25=-3

-40+12+25=-3

-3=-3

 

-4x-3(2x+1)=7

-4x-6x-3=7

-10x=7+3

-10x=10/(-10)

x=-1

4-3(-2+1)=7

4+6-3=7

7=7

Proszę bardzo.