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

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


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


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