化简并求值3a+abc-1/3c^2-3a+1/3c^2,其中a=-1/6,b=2,
人气：120 ℃ 时间：2020-01-28 17:29:57
解答
3a+abc-1/3c^2-3a+1/3c^2
=(3a-3a)+abc+(1/3c^2-1/3c^2)
=abc
=1
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