Question

Решите три уровнения пажалуйста!
1). 3/4x=2 1/4
2). 3x-2-3 (x+5) = - (2-x)-5
3). 4+5( - 3x+7)= - 9

Answer 1

$\frac{3}{4} x = 2 \frac{1}{4} \\ x = 2 \frac{1}{4} \div \frac{3}{4} \\ x = \frac{9 \times 4}{4 \times 3} \\ x = 3$


$3x - 2 - 3 \times (x + 5) = - (2 - x) - 5 \\ 3x - 2 - 3x - 15 = - 2 + x - 5 \\ - 17 = - 7 + x \\ - x = - 7 + 17 \\ - x = 10 \\ x = - 10$


$4 + 5 \times ( - 3x + 7) = - 9 \\ 4 - 15x + 35 = - 9 \\ - 15x + 39 = - 9 \\ - 15x = - 9 - 39 \\ - 15x = - 48 \\ x = \frac{ - 48}{ - 15} \\ x = \frac{16}{5} \\ x = 3 \frac{1}{5} \\ x = 3.2$