Question

me ajudem por favor.​

Answer 1

Resposta:

$a) \: 4 \times (x - 1) = 3 \times (x + 2) \\ 4x - 4 = 3x + 6 \\ 4x - 4 - 3x - 6 = 0 \\ x - 10 = 0 \\ x = 10$

$b) \: 3 \times (x + 5) = 2 \times (x + 10) \\ 3x + 15 = 2x + 20 \\ 3x + 15 - 2x - 20 = 0 \\ x - 5 = 0 \\ x = 5$

$c) \: 7 \times (x + 5) = 3 \times (2 - x) \\ 7x + 35 = 6 - 3x \\ 7x + 35 - 6 + 3x = 0 \\ 10x + 29 = 0 \\ 10x = - 29 \\ \\ x = - \frac{29}{10}$

$d) \: 8 \times (x - 1) = 3 \times (2x - 3) \\ 8x - 8 = 6x - 9 \\ 8x - 8 - 6x + 9 = 0 \\ 2x + 1 = 0 \\ 2x = - 1 \\ \\ x = - \frac{1}{2}$

$e) \: 4 \times (x - 1) = 2 \times (x - 1) \\ 4x - 4 = 2x - 2 \\ 4x - 4 - 2x + 2 = 0 \\ 2x - 2 = 0 \\ 2x = 2 \div (2) \\ x = 1$

$f) \: 5 \times (x - 2) = 2 \times (x - 4) \\ 5x - 10 = 2x - 8 \\ 5x - 10 - 2x + 8 = 0 \\ 3x - 2 = 0 \\ 3x = 2 \\ \\ x = \frac{2}{3}$

$2) \: 5 \times (x + 3) - 2 \times (x - 1) = 20 \\ 5x + 15 - 2x + 2 = 20 \\ 3x + 17 - 20 = 0 \\ 3x - 3 = 0 \\ 3x = 3 \div (3) \\ x = 1$