第1个回答 2011-12-09
1/(1*2)+1/(2*3)+1/(3*4)+1/(4*5)+1/(5*6)=(1/1-1/2)+(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+(1/5-1/6)=1-1/6=5/6
1/(m*n)=1/(n-m)*(1/m-1/n)
第2个回答 2011-12-09
1/2+1/2*1/3+1/3*1/4+1/4*1/5+1/5*1/6
=1/2+1/3*(1/2+1/4)+1/ 5*(1/4+1/6)
=1/2+1/4+1/12
=6/12+3/12+1/12
=10/12
=5/6
第3个回答 2011-12-09
0
是C 语言的题吧~~
1*2=2 1/2 由于1和2都是整型,故为0,同理后边的也为0,如果为float类型,即1.0/2=0.5~~
第4个回答 2011-12-09
1/(1*2)+1/(2*3)+1/(3*4)+1/(4*5)+1/(5*6)=(1/1-1/2)+(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+(1/5-1/6)=1-1/6=5/6