Question

Cálculos
1.)
A) 0,5×=0,3-0,5×
B) 5 (×+3)-2(×-1)=20
C) (2+3)-×=12
D)2×+7=29
E)3×+3=0

Answer 1

1A) 0,5x = 0,3 – 0,5x

0,5x + 0,5x = 0,3

x = 0,3

 

1B) 5 . (x + 3) – 2 . (x – 1) = 20

5x + 15 – 2x + 2 = 20

3x + 17 = 20

3x = 20 – 17

3x = 3

x = 3/3

x = 1

 

1C) (2 + 3) – x = 12

5 – x = 12

x = 5 – 12

x = – 7

 

1D) 2x + 7 = 29

2x = 29 – 7

2x = 22

x = 22/2

x = 11

 

1E)  3x + 3 = 0

3x = – 3

x = – 3/3

x = – 1

 

Bons estudos!