5ab²;-6[3/2a²;b-2/3(4a²;b+2ab²;)]其中a=1,b=-1

5ab²;-6[3/2a²;b-2/3(4a²;b+2ab²;)]其中a=1,b=-1

5ab²;-6[3/2a²;b-2/3(4a²;b+2ab²;)]=5ab²;-9a²;b+4(4a²;b+2ab²;)=5ab²;-9a²;b+16a²;b+8ab²;=13ab²;+7a²;b=13-7=6