6ab-3【3b^2-(a^2-2ab)+1] a=-2 b=-1/3
1个回答
原式=6ab-3(3b^2-a^2+2ab+1)
=6ab-9b^2+3a^2-6ab-3
=-9b^2+3a^2-3
=-9×1/9+3×4-3
=-1+12-3
=8
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