Question

Если не правильно бан!
Сегодня и быстро!
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Answer 1

Ответ:

3

a)

$1.5(x - 3) = 2.5(x - 4) \\ 1.5x - 4.5 = 2.5x - 10 \\ 1.5x - 2.5x = - 10 + 4.5 \\ - x = - 5.5 \\ x = - 5.5 \div - 1 \\ x = 5.5$

b)

$|3x + 5| = 7$

$3x + 5 = 7 \\ 3x = 7 - 5 \\ 3x = 2 \\ x = 2 \div 3 \\ x = \frac{2}{3}$

$3x + 5 = - 7 \\ 3x = - 7 - 5 \\ 3x = - 12 \\ x = - 12 \div 3 \\ x = - 4$

$x1 = - 4 \\ x2 = \frac{2}{3}$