当x等于三分之五时,(1-x)²-4(1-x²)+4(1+x)²的值
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![当x等于三分之五时,(1-x)²-4(1-x²)+4(1+x)²的值](/uploads/image/z/177601-49-1.jpg?t=%E5%BD%93x%E7%AD%89%E4%BA%8E%E4%B8%89%E5%88%86%E4%B9%8B%E4%BA%94%E6%97%B6%2C%281-x%29%26%23178%3B-4%281-x%26%23178%3B%29%EF%BC%8B4%281%EF%BC%8Bx%29%26%23178%3B%E7%9A%84%E5%80%BC)
当x等于三分之五时,(1-x)²-4(1-x²)+4(1+x)²的值
当x等于三分之五时,(1-x)²-4(1-x²)+4(1+x)²的值
当x等于三分之五时,(1-x)²-4(1-x²)+4(1+x)²的值
(1-x)²-4(1-x²)+4(1+x)²
=1-2x+x²-4+4x²+4+8x+4x²
=9x²+6x+1
=9×25/9+6×5/3-3
=25+10+1
=36
4/9+64/9+256/9=36