先化简再求值(-x2+2x-5)(-x2-2x+5),其中x=-1
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![先化简再求值(-x2+2x-5)(-x2-2x+5),其中x=-1](/uploads/image/z/2976944-32-4.jpg?t=%E5%85%88%E5%8C%96%E7%AE%80%E5%86%8D%E6%B1%82%E5%80%BC%EF%BC%88-x2%2B2x-5%29%28-x2-2x%2B5%29%2C%E5%85%B6%E4%B8%ADx%3D-1)
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先化简再求值(-x2+2x-5)(-x2-2x+5),其中x=-1
先化简再求值(-x2+2x-5)(-x2-2x+5),其中x=-1
先化简再求值(-x2+2x-5)(-x2-2x+5),其中x=-1
(-x^2+2x-5)(-x^2-2x+5)=[-x^2+(2x-5)][-x^2-(2x-5)]=x^4-(2x-5)^2=x^4-4x^2+20x-25=-48