2(a²b+3ab²)-4(ab²+3a²b)-(a²b-2ab²),其中a=-1/2,b=1/3

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2(a²b+3ab²)-4(ab²+3a²b)-(a²b-2ab²),其中a=-1/2,b=1/32(a²b+3ab²)

2(a²b+3ab²)-4(ab²+3a²b)-(a²b-2ab²),其中a=-1/2,b=1/3
2(a²b+3ab²)-4(ab²+3a²b)-(a²b-2ab²),其中a=-1/2,b=1/3

2(a²b+3ab²)-4(ab²+3a²b)-(a²b-2ab²),其中a=-1/2,b=1/3
2(a²b+3ab²)-4(ab²+3a²b)-(a²b-2ab²),其中a=-1/2,b=1/3
=2a²b+6ab²-4ab²-12a²b-a²b+2ab²
=4ab²-11a²b
=4*(-1/2)*(1/3)²-11*(-1/2)²*(1/3)
=-2/9 -11/12
=-41/36