Question

3)Calcule a solução das equações:
a) 3a = -45 - 2
b)6(a + 3) - 2 (a - 5 ) = 20
c)2(x - 1) - 1 = 8
d) 5a/2 - 1/4 =8
e)8-2(a + 5) = 5​

Answer 1

Resposta:

a) 3a = -45 - 2

3a=-47

a=-47/3

b)6(a + 3) - 2 (a - 5 ) = 20

6a+18 -2a+10=20

4a=20-10-18

4a=-8

a=-2

c)2(x - 1) - 1 = 8

2x-2 -1=8

2x=8+3

x=11/2

d) 5a/2 - 1/4 =8

5a/2=8+1/4

5a/2=33/4

5a=2.33/4

5a=66/4

5a=33/2

a=$\frac{33}{2}$/5

a=33/10

a=3,3

e)8-2(a + 5) = 5​

8-2a-10=5

-2a=5+10+9

-2a=24

a=-12