Question

resolva as equações de 1 Grau;
com cálculos!

A)-3 (3x-42)=2 (7x-52)
b)$\frac{3+x}{2} -(1-x)=\frac{x-1}{4}$
c)$\frac{3x-1}{2} -\frac{4x+2}{4} -\frac{2x-4}{3} =\frac{x-5}{6}$
d)$\frac{2(x-1)}{3} +\frac{3(1+x)}{2} =\frac{1}{2} -\frac{x-1}{3}$

Answer 1

Resposta:

a)

-3×(3x - 42) = 2×(7x - 52)

-9x + 126 = 14x - 104

-9x -14x = -104 -126

-23x = -230

x = -230/-23

x = 10

b)

(3 + x)/2 -1 + x = (x - 1)/4 , aqui você faz o MMC = 4

2×(3 + x) + 4×( -1 + x) = (x - 1)

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

6 + 2x - 4 + 4x = x - 1

2 + 6x = x - 1

6x - x = - 1 - 2

5x = - 3

x = -3/5

c)

(3x - 1)/2 - (4x - 2)/4 - (2x - 4)/3 = (x - 5)/6 , MMC = 12

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 = -26

x = 6,5

d)

(2x - 2)/3 + (3 +3x)/2 = 1/2 - (x - 1)/3 , MMC = 6

2×(2x - 2) + 3×(3 + 3x) = 3 -2×(x - 1)

4x -4 +9 + 9x = 3 -2x +2

4x + 9x +2x = 5 -9 + 4

15x = 0

x = 0