3a^2-(2a^2-5a+1)-(3a-1)
=3a^2-2a^2+5a-1-3a+1
=a^2+2a
=9-6
=3
先化简,再求值：3a^2-(2a^2-5a+1)-(3a-1),其中a=-3
先化简,再求值：3a^2-(2a^2-5a+1)-(3a-1),其中a=-3
数学人气：474 ℃时间：2020-03-26 12:07:49
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