在2到3时之间,分针和时针成120°角的时_______
(m﹣n)3(n﹣m)2(m﹣n)=______,0.22003×52002=______.
xm=6,xn=2,则xm+n=______.
若xm=3,xn=2,则xm+n=______.
计算:﹣2x4•x3=______.
若am=2,an=5,则am+n等于______.