抛物线y=x²-1999x+2000与X 轴两个交点的坐标为(a,0) (b,0)则(a²-1999a+2000)(b²-1999b+2000)的值是A -1999 B.-2000 C.1999 D 2000求(a²-2000a+2000)(b²-2000b+2000)的值
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