m平方+4m-3m平方-5m+6m平方-2
=4m^2-m-2
当m = - 3/2,原式=4*9/4+3/2-2=17/2
m^2+4m-3m^2-5m+6m^2-2=(m^2-3m^2+6m^2)+4m-5m-2=5m^2-m-2,将m=-3/2代入得5*(-3/2)-(-3/2)-2=-8
m²+4m-3m²-5m+6m²-2
=4m²-m-2
当m=-3/2时,
原式=4×(-3/2)²-(-3/2)-2
=4×(9/4)+3/2-2
=9+3/2-2
=17/2
解:原式=(1-3+6)m平方+(4-5)m-2
=9.5
....