Question

решить б1 даю все свои баллы​

Answer 1

Ответ:

$1) \: 0.3x + 8 = 2 \\ 0.3x = 2 - 8 \\ 0.3x = - 6 \\ x = - 6 \div 0.3 \\ x = - 20 \\ 2) \: 4 - x = 1 + 4x \\ 4 - x - 1 - 4x = 0 \\ - 5x + 3 = 0 \\ - 5x = - 3 \\ 5x = 3 \\ x = \frac{3}{5} = 0.6$

$3) \: 7 - 2(x + 3) = 9 - 6x \\ 7 - 2x - 6 = 9 - 6x \\ 7 - 2x - 6 - 9 + 6x = 0 \\ 4x - 8 = 0 \\ 4x = 8 \\ x = 8 \div 4 \\ x = 2 \\ 4) \: 4(x - 0.5) - 2(x + 0.3) = - 2.6 \\ 4x - 2 - 2x - 0.6 = - 2.6 \\ 4x - 2 - 2x - 0.6 + 2.6 = 0 \\ 2x = 0 \\ х=0$