Question

1- Resolva as equações:
A) 2(5+X)-10=4
B) 3(2b+ 1)+4b=9
C)5X+2(3+X)=5
D)12=1´-2(a-1)
E)T-2(T-3)=3T

Answer 1

Resposta:

a) 2

b) 6

c) $\frac{-1}{7}$

d) $\frac{-9}{2}$

e) 1,5

Explicação passo-a-passo:

a) 10+2x-10 = 4

    10-10-4 = -2x

     -4 = -2x    (-1)

      4 = 2x

      $\frac{4}{2}$ = x

       2 = x

b) 6b+3+4b = 9

   6b+4b = 9-3

   2b = 6

   b = $\frac{6}{2}$

   b = 3

c) 5x+6+2x = 5

   5x+2x = 5-6

   7x = -1

   x = $\frac{-1}{7}$

d) 12 = 1-2a+2

   12-3 = -2a

   9 = -2a     (-1)

   -9 = 2a

   $\frac{-9}{2}$ = a

e) t-2t+6 = 3t

   -t+6 = 3t

   -t-3t = -6

   -4t = - 6   (-1)

   4t = 6

    t = $\frac{6}{4}$    

    t = 1,5

         

       

Answer 2

A) 2
B) 6/10
C) -1/7
D) -11/2
E) 6/4