Question

Rút gọn biểu thức  P = x − 2 x + 2 x − 1 x + 1 x + 2 ,   x > 0

Answer 1

P = x − 2 x + 2 x − 1 x + 1 x + 2 ,   x > 0

P = x − 2 − x + 2 + x x x + 2 = x − 4 x x + 2 = x − 2 x