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化简求值:5a^2+[2a^2+(5a^2-2a)-2(a^2-3a)],其中a=-1/2
人气:285 ℃ 时间:2020-04-26 21:35:08
解答
:5a^2+[2a^2+(5a^2-2a)-2(a^2-3a)],
=5a²+2a²+5a²-2a-2a²+6a
=10a²+4a
=10*1/4+4*(-1/2)
=5/2-2
=1/2
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