（负2/3)的2006次方*（负1.5）的2007次方
=（-2/3）^2006*（-3/2）^2007
=(-2/3)^2006*(-3/2)^2006*(-3/2)
={(-2/3)*(-3/2)}^2006*(-3/2)
=1*(-3/2)
=-3/2