2a+3分之2+3-2a分之3+4a方-9分之2a+15

问题描述:

2a+3分之2+3-2a分之3+4a方-9分之2a+15

理解原题应为:
2/(2a+3)+3/(3-2a)+(2a+15)/(4a²-9)
将前两项分式通分,
原式=[(3-2a)+3(2a+3)]/[(2a+3)(3-2a)]+(2a+15)/(4a²-9)
=(2a+15)/(9-4a²)-(2a+15)/(9-4a²)
=0