2/1+6/1+12/1+----------462/1的值 简便运算
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2/1+6/1+12/1+----------462/1的值 简便运算
2/1+6/1+12/1+----------462/1的值 简便运算
2/1+6/1+12/1+----------462/1的值 简便运算
=1/1×2+1/2×3+1/3×4+1/4×5+……+1/21×22
=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+……+1/21-1/22
=1-1/22
=21/22
1/2+1/6+1/12+1/20.+1/380
2%1+6%1+12%1+20%1+30%1
1/2+1/6+1/12+1/20+1/30
1/2-1/6-1/12-1/20-...-1/110
1/2,-1/6,1/12,-1/20,1/30
2/1+6/1+12/1+24/1+48/1
1/2+1/6+1/12+1/20+.1/90
2/1+6/1+12/1+20/1+...+2450/1
1/2+1/6+1/12+...+1/4054182 等于多少?
1/2+1/6+1/12+...+1/56=快
1/2+1/6+1/12+1/20=
1/2+1/6+1/12+.1/9900
1/2+1/6+1/12+.+1/9900
1/2+1/6+1/12+...+1/72简便运算
计算1/2+1/6+1/12+1/20.1/90
1/2+1/6+1/12+1/20(简算)
1/2+1/6+1/12+1/20的数列
2/1+6/1+12/1+.+4038090/1等于多少?