m的平方+4m+9的值等于5,
m^2+4m+9=5,
m^2+4m+4+5=5
(m+2)^2=0,
m+2=0
m=-2
所以 0.25m^2+m-10
=0.25(-2)^2+(-2)-10
=0.25*4-2-10
=1-12
=-11