①2( )-x^2+2=3x^2-6;②5m^2-3m+1=(m^2+m-2)+( )
1个回答
2(2x^2-4)-x^2+2=3x^2-6
5m^2-3m+1=(m^2+m-2)+( 4m^2-4m+3)
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