题目内容
化简求值:3a2b-[9a2b-2(3a2b+2a2)]-(3a2b-8a2),其中a=
,b=-3.
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原式=3a2b-[9a2b-6a2b-4a2]-3a2b+8a2=-9a2b+6a2b+4a2+8a2=-3a2b+12a2,
当a=
,b=-3时,原式=-3×
×(-3)+12×
=
.
当a=
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