5ab²-6[3/2a²b-2/3(4a²b+2ab²)]其中a=1,b=-1
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5ab²-6[3/2a²b-2/3(4a²b+2ab²)]其中a=1,b=-15ab²-6[3/2a²b-2/3(4a²b+2ab
5ab²-6[3/2a²b-2/3(4a²b+2ab²)]其中a=1,b=-1
5ab²-6[3/2a²b-2/3(4a²b+2ab²)]其中a=1,b=-1
5ab²-6[3/2a²b-2/3(4a²b+2ab²)]其中a=1,b=-1
5ab²-6[3/2a²b-2/3(4a²b+2ab²)]
=5ab²-9a²b+4(4a²b+2ab²)
=5ab²-9a²b+16a²b+8ab²
=13ab²+7a²b
=13-7
=6