2/1+6/1+12/1+20/1+30/1+42/1+56/1+72/1+90/1的答案
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2/1+6/1+12/1+20/1+30/1+42/1+56/1+72/1+90/1的答案2/1+6/1+12/1+20/1+30/1+42/1+56/1+72/1+90/1的答案2/1+6/1+12
2/1+6/1+12/1+20/1+30/1+42/1+56/1+72/1+90/1的答案
2/1+6/1+12/1+20/1+30/1+42/1+56/1+72/1+90/1的答案
2/1+6/1+12/1+20/1+30/1+42/1+56/1+72/1+90/1的答案
你把分子分母写倒了.二分之一应该写为：1/2
所以,你的式子应该是：
1/2 + 1/6 + 1/12 + 1/30 + 1/42 + 1/56 + 1/72 + 1/90
= 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) + (1/2 - 1/3) + (1/3 - 1/4) + (1/4 - 1/5) + (1/5 - 1/6) + (1/6 - 1/7) + (1/7 - 1/8) + (1/8 - 1/9) + (1/9 - 1/10)
= 1 - 1/10
= 9/10
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,-1/20,1/30
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72
1+1/2+1/12+1/6+1/20+1/30+1/40+1/56
1+1/2+1/6+1/12+1/20+1/30.+1/901+1/2+1/6+1/12+1/20+1/30+.+1/90简便计算
1/2+1/6+1/12+1/20+1/30+1/42+1/56 简算
1/2+1/6+1/12+1/20+1/30+1/42+1/56简算,
简便运算：1/2+1/6+1/12+1/20+1/30+1/42+1/56
1+1/2+1/6+1/12+1/20+1/30+1/42的简便计算
2/1+6/1+12/1+20/1+30/1+42/1+56/1=?
1/2 - 1/6 - 1/12 - 1/20 - 1/30 - 1/42 - 1/56怎么算
1/2+1/6+1/12+1/20+1/30+.1/380+1/420=
1+1/2+1/6+1/12+1/20+1/30+1/42=?
1/2+1/6+1/12+1/20+1/30+1/42+1/56
1/2-1/6-1/12-1/20-1/30-1/42-1/56等于多少
2/1+6/1+12/1+20/1+30/1+42/1+56/1=