=1/(1*2)+1/(2*3)+1/(3*4)+1/(4*5)+1/(5*6)+1/(6*7)+1/(7*8)+1/(8*9)+1/(9*10)=(1-1/2)+(1/3-1/4)+(1/5-1/6)+...+(1/9-1/10)=1-1/10=9/10
一道六年级分数简算题1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90=?写出简算过程
1个回答
相关问题
-
简算：1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90
-
简算6/1+12/1+20/1+30/1+42/1+56/1+72/1+90/1
-
1/2+1/6+1/12+1/20+1/30+1/42+1/56 简算
-
1/30+1/42+1/56+1/72 简算
-
简算：1/6+1/12+1/20+1/30+.1/72+1/90
-
简算1/12+1/20+1/30+1/42+1/56
-
一道简算题!1/30+1/45+1/56+1/72
-
一道小学分数题1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90=?
-
1/6+1/12+1/20+1/30+1/42 简算
-
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90=1怎么算简便?