Question

resolva as equações de 1° grau !
me ajudem por favor ​

Answer 1

d) Resposta: -3

3 + x x - 1
——- - (1 - x) = ——
2 4

*Tira o mmc: 4

3 + x x - 1
——- - (1 - x) = ——
2 4

4 : 2 = 2(3 + x)
4 : 1 = 4 . 1 = 4
4 : 4 = 1(x - 1)

2(3 + x) - 4 = 1(x - 1)
6 + 2x - 4 = x - 1
2x - x = -1 - 6 + 4
x = -3

e) Resposta: 3,5

3x - 1 4x + 2 2x - 4 x - 5
——— - ———— - ———— = ———
2 4 3 6

*Tira o mmc: 12

3x - 1 4x + 2 2x - 4 x - 5
——— - ———— - ———— = ———
2 4 3 6

12 : 2 = 6(3x - 1)
12 : 4 = 3(4x + 2)
12 : 3 = 4(2x - 4)
12 : 6 = 2(x - 5)

6(3x - 1) - 3(4x + 2) - 4(2x - 4) = 2(x - 5)
18x - 6 - 12x - 6 - 8x + 16 = 2x - 10
18x - 12x - 8x - 2x = -10 + 6 + 6 - 16
-4x = -14 . (-1)
x = 3,5