如果是同类项，那么m=_____,n=_____, mn=_______.
=" _________" .
的平方根是____________.
=______｡
=________;
=_______;
是同类项，那么m=_____,n=_____, mn=_______.
=" _________" .
的平方根是____________.
=______｡
=________;
=_______;
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