若an-3·a2n+1=a10 ,则n= ________________.
计算:m·m2·m9= ________________.
若xm=2,xn=-,则xm+n的值为________________.
a2·a5= ________________.
-32×33= ________________.
x· ________________=-x7;(-a)4·(-a3)= ________________;-a2·(-a)2·(-a)3= ________________.