化简求值:1/4(-4x²+2x-8)-(-1/2x-1),其中x=1/2打错了是化简求值:1/4(-4x²+2x-8)-(1/2x-1),其中x=1/2
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![化简求值:1/4(-4x²+2x-8)-(-1/2x-1),其中x=1/2打错了是化简求值:1/4(-4x²+2x-8)-(1/2x-1),其中x=1/2](/uploads/image/z/1344894-6-4.jpg?t=%E5%8C%96%E7%AE%80%E6%B1%82%E5%80%BC%EF%BC%9A1%2F4%EF%BC%88-4x%26%23178%3B%2B2x-8%29-%28-1%2F2x-1%29%2C%E5%85%B6%E4%B8%ADx%3D1%2F2%E6%89%93%E9%94%99%E4%BA%86%E6%98%AF%E5%8C%96%E7%AE%80%E6%B1%82%E5%80%BC%EF%BC%9A1%2F4%EF%BC%88-4x%26%23178%3B%2B2x-8%29-%281%2F2x-1%29%2C%E5%85%B6%E4%B8%ADx%3D1%2F2)
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化简求值:1/4(-4x²+2x-8)-(-1/2x-1),其中x=1/2打错了是化简求值:1/4(-4x²+2x-8)-(1/2x-1),其中x=1/2
化简求值:1/4(-4x²+2x-8)-(-1/2x-1),其中x=1/2
打错了
是
化简求值:1/4(-4x²+2x-8)-(1/2x-1),其中x=1/2
化简求值:1/4(-4x²+2x-8)-(-1/2x-1),其中x=1/2打错了是化简求值:1/4(-4x²+2x-8)-(1/2x-1),其中x=1/2
原式
=-x²+1/2x-2-1/2x+1
=-x²+(1/2x-1/2x)+1-2
=-x²-1
=-(1/2)²-1
=-5/4