(3m²-m+5)-(m+4)化简

(3m²-m+5)-(m+4)化简
(3m²-m+5)-(m+4)化简

(3m²-m+5)-(m+4)化简
原式=3m²-m+5-m-4
=3m²-2m+1

=3m²-2m+1

=3m²-2m+1
=3（m²-2/3m)+1
=3(m-1/3)²+2/3