5x丨m丨y²-(m-2)xy-3"(丨m丨代表x的丨m丨次方) m=?5x丨m丨y²-(m-2)xy-3是四次三项式,m为2?

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5x丨m丨y²-(m-2)xy-3"(丨m丨代表x的丨m丨次方) m=?5x丨m丨y²-(m-2)xy-3是四次三项式,m为2?

5x丨m丨y²-(m-2)xy-3"(丨m丨代表x的丨m丨次方) m=?5x丨m丨y²-(m-2)xy-3是四次三项式,m为2?
∴|m|+2=4;
|m|=2;
m=±2;
m-2≠0;
∴m=-2;
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