( 3)乘以( 4)=( 12)=( 60)除以(5 ),
1、已知a.b小于0,则ab>0
∴|a|/a +b/|b| +|ab|/(ab)
=-a/a-b/b+(ab)/(ab)
=-1-1+1
=-1
2、(-2)^2011 +(-2)^2010
=(-2)×(-2)^2010 +(-2)^2010
=-(-2)^2010
=-2^2010
3、(2/3)^4 ×(3/2)^5
=(2/3)^4 ×(3/2)^4 ×(3/2)
=[(2/3)(3/2)]^4 ×(3/2)
=1×(3/2)
=3/2