a,2³.x+5².x=2.5²+2³-33
⇔ x(2³ + 5²) = 2 . 25 + 8 - 33
⇔ x . (8 + 10) = 25
⇔ x . 18 = 25
⇔ x = $\frac{25}{18}$
b,15:x+2=3³+3:10
⇔ 15 : x = 3³ + 3 : 10 - 2
⇔ 15 : x = $\frac{250}{10}$
⇔ x = $\frac{3}{5}$
c,2² + 3.x - 5 + 14 + 5² + 124 : 2²
???
Phần c sai đề ak?