数学:2(a²b+3ab²)-4(ab²+3a²b)-(a²b-2ab²),其中a=-1/2,b=1/3
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数学:2(a²b+3ab²)-4(ab²+3a²b)-(a²b-2ab²),其中a=-1/2,b=1/3
数学:2(a²b+3ab²)-4(ab²+3a²b)-(a²b-2ab²),其中a=-1/2,b=1/3
数学:2(a²b+3ab²)-4(ab²+3a²b)-(a²b-2ab²),其中a=-1/2,b=1/3
2(a²b+3ab²)-4(ab²+3a²b)-(a²b-2ab²)
=2a²b+6ab²-4ab²-12a²b-a²b+2ab²
=(2a²b-12a²b-a²b)+(6ab²-4ab²+2ab²)
=-11a²b+4ab²
=ab(4b-11a)
=(-1/2)X(1/3)[4X(1/3)-11X(-1/2)]
=(-1/6)(4/3+11/2)
=(-1/6)X(41/6)
=-41/36
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