Question

Proszę o 20 Równań np. 6x+2=3-7x Daję NAJ:D:D Z góry Dziękuje:)

Answer 1

1)6x+2=3-7x

6x+7x=3-2

13x=1   /:13

x=1/13

 

 

2)x+8=4-2x

x+3x=4+8

4x=12  /;4

x=3

 

3)2y=10+20

2y=30  /;2

y=15

 

4) ½x+5=6 -½x

½x+½x=6-5

x=1

5) 12y-4=y+7

12y-y=7+4

11y=11  /;11

y=1

6)4x+6=12x -4

4x-12x=-4-6

-8x =-10  /:(-8)

x=10/8=5/4=1¼

6) 19-3y =1

-3y=1-19

-3y =-18   /:(-3)

y=6

7)y+2y=5+y

3y-y=5

2y=5  /;2

y=2,5

8) 4½+9x =-½-x

9x+x=-½ -4½

10x=-5  /:10

x=-1/2

9) 6y -2=2y -3

6y-2y=-3+2

4y= -1 

y=-1/4

10) -11+19x=- 11x -1

19x+11x=-1 +11

30x=10  /:3

x=1/3

11) 7¾x+x=8+¾

8¾x=8¾  /:8¾

x=1

12) 6y-6=12 -18y

6y+18y=12+6

24y=18  /;24

y=18/24

y=3/4

13) y+4y=y-5

5y-y=-5

4y=-5

y =-5/4 =-1¼

 

14) x-3+7x=-2+x

8x-x=-2+4

7x =2  /:7

x=2/7

15) 6x-1 =-1 +2 =2x

6x-2x=1+1

4x=2  /:4

x=2/4=1/2

16)  y+3y -5=y

4y-y=5

3y=5

y =5/3 =2⅔

17) x-2x =30+14x

-x-14x= 30

-15x =30 /;(-15)

x=-2

18) 10x-8 =12x 

10x-12x =8

-2x =8  /;(-2)

x=-4

19) 4+y=y-9y -1

y-y+9y=-1-4

9y=-5  /:(-9)

y=-5/9

20)  16x -13 =-3 -4x

16x+4x= -3+13

20x =10  /:20

x=1/2

 

 

 

Answer 2

1.

4x-2= 2x

4x -2x = 2

 2x =2 /:2

   x = 1

2.

x+ 10 = 5

x = 5 -10

x = -5

3.

-2x -1/2 = 8   /*2

-4x -1 = 16

-4x = 16 +1

-4x = 17 /:(-4)

   x = - 17/4

4.

3/4(x -3) =  1/4 

3/4x - 9/4 = 1/4 /*4

 3x -9 = 1

 3x = 9+1

 3x= 10 /:3

   x = 10/3

5.

(1/2 *x) +2 = 8 

1/2x = 8-2

1/2x = 6 /:1/2

    x = 6*2/1

    x = 12

6.

(2i1/2 -x) :2 = 6  /*2

 2i1/2 -x = 12

 -x = 12 -2i1/2

 -x = 9i1/2   /*(-1)

   x = -9i1/2

7.

(3i2/3 +x)*3/4 = 4

(11/3 +x) *3/4= 4

33/12 +3/4x = 4   /*12

 33 + 9x = 48

   9x = 48 -33

   9x = 15 /:9

    x = 15/9

8. 

0,5x + 2,5 = 0,5x

0,5x -0,5x = -2,5

      0 = -2,5   nie ma rozwiazania, rownanie sprzeczne

9.

x +(x+2) *4 = 10

x + 4x +8 = 10

x +4x = 10 -8

  5x = 2 /:5

    x =2/5

10.

2,5x -x = 30

 1,5x = 30 /:1,5

    x = 20

11.

15x - 10= 5x

15x -5x = 10

  10x = 10/:10

    x = 1

12.

8x +3 +4x = 6x-3x

8x +4x -6x +3x = -3

    9x = -3 /:9

      x = -3/9

13.

7x = 14x -2x +5

7x -14x +2x = 5

    -5x = 5 /:(-5)

        x = -1

14. 

9x +4 -10= 11 +3x

9x -3x = 11 -4 +10

    6x = 17/:6

    x = 17/6

15.

x -12 + 6x= 9

x +6x = 9 +12

     7x = 21 /:7

        x = 3

16.

5,2x - 3,4x = 3,6

     1,8x = 3,6 /:1,8

           x = 2

17.

3/8x +4 = 5/8    /*8

3x +32 = 5

3x = 5 -32

 3x = -27 /:3

  x = -9

18.

2(4x +4) = 2

8x +8 = 2

8x = 2 -8

 8x = -6/:8

   x = -6/8= -3/4

19. 

20x +10 -5x = 5x 

20x -5x -5x = -10

     10x = -10 /:10

          x = -1

20. 

x + 2x +7x +20= 40

10x = 40-20

 10x = 20/:10

   x = 2