题目内容
化简后求值:3(2a2-3a+1)-2(2-5a+3a2)-1,其中a=-
.
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原式=6a2-9a+3-4+10a-6a2-1,
=6a2-6a2-9a+10a+3-4-1,
=a-2,
当a=-
时,原式=a-2=-
-2=-
.
=6a2-6a2-9a+10a+3-4-1,
=a-2,
当a=-
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