已知|a-2|+(b+1)+c²=0,求a²-2ab-5a²+12ac+3ab-c²-8ac-2a²的值急
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![已知|a-2|+(b+1)+c²=0,求a²-2ab-5a²+12ac+3ab-c²-8ac-2a²的值急](/uploads/image/z/1998577-1-7.jpg?t=%E5%B7%B2%E7%9F%A5%7Ca-2%7C%2B%28b%2B1%29%2Bc%26%23178%3B%3D0%2C%E6%B1%82a%26%23178%3B-2ab-5a%26%23178%3B%2B12ac%2B3ab-c%26%23178%3B-8ac-2a%26%23178%3B%E7%9A%84%E5%80%BC%E6%80%A5)
已知|a-2|+(b+1)+c²=0,求a²-2ab-5a²+12ac+3ab-c²-8ac-2a²的值急
已知|a-2|+(b+1)+c²=0,求a²-2ab-5a²+12ac+3ab-c²-8ac-2a²的值
急
已知|a-2|+(b+1)+c²=0,求a²-2ab-5a²+12ac+3ab-c²-8ac-2a²的值急
|a-2|+(b+1)+c²=0
可知
a-2=0
b+1=0
c=0
可得a=2
b=-1
a²-2ab-5a²+12ac+3ab-c²-8ac-2a²
=a²-5a²-2a²-2ab+3ab+12ac-8ac-c²
=-6a²+ab+4ac-c²
=-6×2²+2×(-1)+4×2×0-0²
=-24-2+0-0
=-26