Question

RESOLVA AS EQUAÇÕES DO 1° GRAU :

a)20x60=5x

b)5(1-x)-2×+1=-3(2+x)

c)4(x-3)=2×-5

d)x-3=5

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Answer 1

a)

20x - 60= 5x

20x - 5x= 60

15x= 60

x= 60/15

x= 4

b)

5(1 - x) - 2x + 1= - 3(2 + x)

5 - 5x - 2x + 1= - 6 - 3x

- 5x - 2x + 3x= - 6 - 5 - 1

- 4x= - 12 >>.(-1)

4x= 12

x= 12/4

x= 3

c)

4(x - 3)= 2x - 5

4x - 12= 2x - 5

4x - 2x= - 5 + 12

2x= 7

x= 7/2

x= 3,5

d)

x - 3= 5

x= 5 + 3

x= 8