Cho biểu thức P = a+2 / a+3 - 5 / (a+3) (a-2) - a / a^2 -2a

a) Điều kiện xác định:a+3≠0a−2≠0a≠0 hay a≠−3;0;2

b) 

P=a+2a+3−5a+3a−2−aa2−2a     =a+2a+3−5a+3a−2−1a−2     =a+2a−2a+3a−2−5a+3a−2−a+3a+3a−2     =a+2a−2−5−a+3a+3a−2     =a2−4−5−a−3a+3a−2     =a2−a−12a+3a−2     =a+3a−4a+3a−2     =a−4a−2

Vậy P=a−4a−2