已知绝对值2006-a=根号a-2007=a,求a-2006的平方+18的值.
已知绝对值2006-a=根号a-2007=a,求a-2006的平方+18的值.
已知绝对值2006-a=根号a-2007=a,求a-2006的平方+18的值.
已知绝对值2006-a=根号a-2007=a,求a-2006的平方+18的值.
因为a-2007>0
所以a>2007
因为2006
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