Question

Resolva as equacoes de 1 grau a) -3(3×-42)=2(7×52) b) × + 1-×=1
2 5 2

Answer 1

a) -3(3x-42)=2(7x-52)

-9x + 126 = 14x - 104

126 + 104 = 14x + 9x

230 = 23x

x = 230/23

x = 10

b) x/2 + 1 - x/5 =1/2

5x + 10 - 2x = 5

3x = 5-10

x = -5/3

c) x+3/2 + x+2/3 = -1/2

3(x+3)+2(x+2)=3

3x + 9 + 2x + 2 = 3

3x + 2x = 3 - 9 - 4

5x = 3-13

5x = -10

x = -10/5

x = -2

d) 3 + x/2 - (1-x) = x - 1 / 4

3+x/2 - 1 + x = x - 1/4

3 + x/2 - 1 = -1/4

2 + x/2 = - 1/4

8 + 2x = -1

2x = -9

x = -9/2

e) 3x - 1 / 2 - 4x + 2/4 - 2x - 4/3 = x-5/6

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

18x - 6 - 12x - 6 - 8x + 16 = 2x - 10

18x - 12x - 8x - 2x = 6 + 6 - 16 - 10

-4x = -14 (-1)

x = 14/4

x = 7/2

f) 2(x-1)/3 + 3(1+x)/2 = 1/2 - x-1/3

2x - 2/3 + 3+3x/2 - x-1/3

4(2x-2) + 3(3+3x) - 4(x-1) / 12

8x - 8 + 9 + 9 x - 4x + 4 / 12

13x + 5/12

me dê a melhor resposta, pois demorei 30 minutos para resolver essas contas hahaha