Question

1) resolva as equaçães
a)4(×-2)=2×+4
b)3×+6=-3
c)8×+4-3=6×+2
d)2(+-1)-3(×-1)=2×+4

2 calcule as inequcoes
a)3(×-2)<7×-2×
b)7(×+1)>6-5×
c)5×-3(×-2)>20-2×
d)3(2×-3)+4(1+×)<17​

Answer 1

Resposta:

Explicação passo-a-passo:

1) resolva as equações

a)4(×-2)=2×+4

4x - 8 = 2x + 4

2x - 12 >>> x = 6

b)3×+6=-3

3x + 6 +3

3x +9>>>x = -3

c)8×+4-3=6×+2

8x + 1 - 6x -2

2x - 1 >>>x = 1/2

d)2(+-1)-3(×-1)=2×+4

-2 -3x + 3 - 2x -4

-5x - 3 >>> x = 3/5

2) calcule as inequações

a)3(×-2)<7×-2×

3x - 6<5x

3x -5x < 6

-2x< 6  (multiplicando por -1)

2x>6

x>3

b)7(×+1)>6-5×

7x + 5x > 6 - 1

12x > 5

x> 5/12

c)5×-3(×-2)>20-2×

5x - 3x + 2x > 20 - 6

4x>14

x>14/4 >>> x>7/2

d)3(2×-3)+4(1+×)<17​

6x - 9 + 4 +4x < 17

10x < 22

x<22/10 >>> x< 11/5