-1*1/2=-1+1/2
-1/2*1/3=-1/2+1/3
-1/3*1/4=-1/3+1/4
.
-1/n*1/(n+1)=-1/n+1/(n+1)我要文字解釋某數(shù)的負(fù)分之1乘以該數(shù)加1的分之1，就等于某數(shù)的負(fù)分之1減該數(shù)加1的分之1。例如：負(fù)128分之1乘以129分之1=負(fù)128分之1減129分之1那【-1*1/2】+【-1/2*1/3】+【-1/3*1/4】+············+【-1/2011*1/2012】用規(guī)律計(jì)算是什么【-1*1/2】+【-1/2*1/3】+【-1/3*1/4】+············+【-1/2011*1/2012】=(-1+1/2)+(-1/2+1/3)+(-1/3+1/4)+(-1/4+1/5)+...........+(-1/2011+1/2012)=-1+1/2-1/2+1/3-1/3+1/4-1/4+1/5+..........-1/2011+1/2012=-1+1/2012=-2011/2012我提的問(wèn)題是乘法滴，不是加法是將分?jǐn)?shù)的乘法變換成分?jǐn)?shù)的加法。