先化简,再求值:(3a²b-ab²)-2(ab²-3a²b),其中a=-2,b=3thank you~
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先化简,再求值:(3a²b-ab²)-2(ab²-3a²b),其中a=-2,b=3thank you~
先化简,再求值:(3a²b-ab²)-2(ab²-3a²b),其中a=-2,b=3
thank you~
先化简,再求值:(3a²b-ab²)-2(ab²-3a²b),其中a=-2,b=3thank you~
您好:
(3a²b-ab²)-2(ab²-3a²b),
=3a²b-ab²-2ab²+6a²b
=9a²b-3ab²
=9x(-2)²x3-3x(-2)x3²
=9x4x3-3x2x9
=108-54
=54
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