若(2x²-ax-y+6)-(2bx²-3x+6y+1)的值与字母x无关若(2x²-ax-y+6)-(2bx²-3x+6y+1)的值与字母x的取值无关,求4(a²-2ab-b²)-(3a²+ab+b²)的值是多少
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![若(2x²-ax-y+6)-(2bx²-3x+6y+1)的值与字母x无关若(2x²-ax-y+6)-(2bx²-3x+6y+1)的值与字母x的取值无关,求4(a²-2ab-b²)-(3a²+ab+b²)的值是多少](/uploads/image/z/1251372-12-2.jpg?t=%E8%8B%A5%EF%BC%882x%26%23178%3B-ax-y%2B6%EF%BC%89-%EF%BC%882bx%26%23178%3B-3x%2B6y%2B1%EF%BC%89%E7%9A%84%E5%80%BC%E4%B8%8E%E5%AD%97%E6%AF%8Dx%E6%97%A0%E5%85%B3%E8%8B%A5%EF%BC%882x%26%23178%3B-ax-y%2B6%EF%BC%89-%EF%BC%882bx%26%23178%3B-3x%2B6y%2B1%EF%BC%89%E7%9A%84%E5%80%BC%E4%B8%8E%E5%AD%97%E6%AF%8Dx%E7%9A%84%E5%8F%96%E5%80%BC%E6%97%A0%E5%85%B3%2C%E6%B1%824%EF%BC%88a%26%23178%3B-2ab-b%26%23178%3B%EF%BC%89-%EF%BC%883a%26%23178%3B%2Bab%2Bb%26%23178%3B%EF%BC%89%E7%9A%84%E5%80%BC%E6%98%AF%E5%A4%9A%E5%B0%91)
若(2x²-ax-y+6)-(2bx²-3x+6y+1)的值与字母x无关若(2x²-ax-y+6)-(2bx²-3x+6y+1)的值与字母x的取值无关,求4(a²-2ab-b²)-(3a²+ab+b²)的值是多少
若(2x²-ax-y+6)-(2bx²-3x+6y+1)的值与字母x无关
若(2x²-ax-y+6)-(2bx²-3x+6y+1)的值与字母x的取值无关,求4(a²-2ab-b²)-(3a²+ab+b²)的值是多少
若(2x²-ax-y+6)-(2bx²-3x+6y+1)的值与字母x无关若(2x²-ax-y+6)-(2bx²-3x+6y+1)的值与字母x的取值无关,求4(a²-2ab-b²)-(3a²+ab+b²)的值是多少
若(2x²-ax-y+6)-(2bx²-3x+6y+1)的值与字母x的取值无关,
(2-2b)x²+(3-a)x-7y+5;
∵值与字母x的取值无关
∴2-2b=0;
b=1;
3-a=0;
a=3;
求4(a²-2ab-b²)-(3a²+ab+b²)的值是多少
=4a²-8ab-4b²-3a²-ab-b²
=a²-9ab-5b²
=9-9×1×3-5×1×1
=9-27-5
=-23;
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只要包含x的式子,其系数都为0,接下来自己完成