=论键盘侠的修养=

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        x*x+y*y=3

        x*x*x+y*y*y=5

        3≥x*x≥0

        3≥y*y≥0

        当x*x*x＞0；y*y*y＞0时

        5＞x*x*x＞0

        5＞y*y*y＞0

        当x*x*x＜0；y*y*y＞0时

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