根号a^2=()(a>0)()(a=0)()(a

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根号a^2=()(a>0)()(a=0)()(a

根号a^2=()(a>0)()(a=0)()(a
根号a^2=()(a>0)
()(a=0)
()(a

根号a^2=()(a>0)()(a=0)()(a
a
0
-a

a,0,-a