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如图.高中题目iRTTTTTTTTTTTTTTTTTTTT
如图.高中题目i
RTTTTTTTTTTTTTTTTTTTT
如图.高中题目iRTTTTTTTTTTTTTTTTTTTT
3种情况
当绝对值里面小于0时 有
x的平方