已知:单项式x²,-2x²,3x²,-4x²,5x²,-6x²……中第2004给单项式是什么?求出前2004给单项式的和.当x=二分之一时,求出多项式的值
来源:学生作业帮助网 编辑:作业帮 时间:2024/09/04 07:44:12
![已知:单项式x²,-2x²,3x²,-4x²,5x²,-6x²……中第2004给单项式是什么?求出前2004给单项式的和.当x=二分之一时,求出多项式的值](/uploads/image/z/401723-35-3.jpg?t=%E5%B7%B2%E7%9F%A5%3A%E5%8D%95%E9%A1%B9%E5%BC%8Fx%26%23178%3B%2C-2x%26%23178%3B%2C3x%26%23178%3B%2C-4x%26%23178%3B%2C5x%26%23178%3B%2C-6x%26%23178%3B%E2%80%A6%E2%80%A6%E4%B8%AD%E7%AC%AC2004%E7%BB%99%E5%8D%95%E9%A1%B9%E5%BC%8F%E6%98%AF%E4%BB%80%E4%B9%88%3F%E6%B1%82%E5%87%BA%E5%89%8D2004%E7%BB%99%E5%8D%95%E9%A1%B9%E5%BC%8F%E7%9A%84%E5%92%8C.%E5%BD%93x%3D%E4%BA%8C%E5%88%86%E4%B9%8B%E4%B8%80%E6%97%B6%2C%E6%B1%82%E5%87%BA%E5%A4%9A%E9%A1%B9%E5%BC%8F%E7%9A%84%E5%80%BC)
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已知:单项式x²,-2x²,3x²,-4x²,5x²,-6x²……中第2004给单项式是什么?求出前2004给单项式的和.当x=二分之一时,求出多项式的值
已知:单项式x²,-2x²,3x²,-4x²,5x²,-6x²……中第2004给单项式是什么?
求出前2004给单项式的和.当x=二分之一时,求出多项式的值
已知:单项式x²,-2x²,3x²,-4x²,5x²,-6x²……中第2004给单项式是什么?求出前2004给单项式的和.当x=二分之一时,求出多项式的值
项式x²,-2x²,3x²,-4x²,5x²,-6x²……中第2004给单项式是-2004x²
前2004单项式的和:
x²-2x²+3x²-4x²+5x²-6x²+…+2003x²-2004x²
=(1-2+3-4+5-6+…+2003-2004)x²
=[(1-2)+(3-4)+(5-6)+…+(2003-2004)]x²
=[(-1)×1002]x²
=-1002x²
当x=1/2时,多项式的值=-1002×(1/2)²=-501
-2004x^2
Sn=2003x^2
x=1/2.Sn=2003*1/4=2003/4
是-2004x²