encontre a solução para as equações do 1º grau:
a) x + 4 = 12
b) 18x – 43 = 65
c) 4x + 10 = 45 – 3x
d) 8x – 11 = 4x + 13
e) 3x – 10 + 13 = – 2x + 28
f) 13x – 23 – 45 = – 7x + 12
g) 24x – 16 = 20x – 5
h) 2x – 6 = – x + 15
i) 50x + 200 = 20x – 80 + 100
j) 3x + 5 + 2x + 6 = x + 27
k) 2x – 10 + 7x + 10 = 180
l) 4t – 2t + 5 = 3 – 8t – 18
Soluções para a tarefa
Resposta:
Explicação passo-a-passo:
a) x + 4 = 12 x = 12-4 x = 8
b) 18x – 43 = 65 18x = 65 + 43 18x = 108 x = 6
c) 4x + 10 = 45 – 3x 4x + 3x = 45 - 10 7x = 35 x = 5
d) 8x – 11 = 4x + 13 8x - 4x = 13 + 11 4x = 24 x = 8
e) 3x – 10 + 13 = – 2x + 28
3x+2x = 28 -3 5x = 25 x = 5
f) 13x – 23 – 45 = – 7x + 12
13x + 7x = 12 + 68 20x = 80 x = 4
g) 24x – 16 = 20x – 5 24x - 20x = 16 - 5 4x = 11 x = 11/4
h) 2x – 6 = – x + 15 2x + x = 15 + 6 3x = 21 x = 7
i) 50x + 200 = 20x – 80 + 100
50x - 20x = 20 - 200 30x = -180 x = -180/30 x = -6
j) 3x + 5 + 2x + 6 = x + 27
5x - x = 27 - 11 4x = 16 x = 4
k) 2x – 10 + 7x + 10 = 180 9x = 180 x = 20
l) 4t – 2t + 5 = 3 – 8t – 18
2t + 8t = -20 10t = -20 t = -2