MATEMÁTICA

29/05/12

Correção

A)         3x-7 + x-1 = 2x+3

          12          5       6

R: 6x – 14 +3x -3 = 8x + 12

6x +3x -8x = +12 +14 +3

X = 29

S=(29)

B)        2x+1 – x-3 =  x

4       5       3

R: 30x + 15 + 12x + 36 = 20x

30X – 12x – 20 = -36 – 15

-2x = - 51 (-1)

X= 51

      2

S=(51)

      2

C) x-1 – x+3 = 4

     3         5       1

R: 5x -10 -3x -9 = 60

5x -3x = 60 + 9 + 10

2x = 79

X= 79

      2

S=(79)

       2

D)        X-4 – x+1 = x

          5        2      10

R: 2x -8 – 5x + 25 = x + 2

2x -5x – 1x = + 2 – 25 + 8

+ 4x = 15

X = 15

       4

S=(15)

       4

E)        2x – x+1 = x

3        2       4

R: 8x – 6x – 6 = 3x

8x – 6x – 3x = 6

-x = 6 (-1)

X= -6

S=(-6)

                      SEGUIMENTO SENTRAL

DE UM CIRCULO