2x²-1/2[6-2(x²-2)]
=2x²-1/2(6-2x²+4)
=2x²-3+x²-2
=3x²-5
=3x4-5
=12-5
=7
不懂的欢迎追问.
化简并求值:已知代数式2x²-1/2[6-2(x²-2)],其中x=-2
化简并求值:已知代数式2x²-1/2[6-2(x²-2)],其中x=-2
数学人气：384 ℃时间：2020-04-18 11:21:03
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