2/1+6/1+12/1+20/1+30/1+42/1+56/1+72/1+90/1怎么算?/前是分母/后是分子
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![2/1+6/1+12/1+20/1+30/1+42/1+56/1+72/1+90/1怎么算?/前是分母/后是分子](/uploads/image/z/142538-50-8.jpg?t=2%2F1%2B6%2F1%2B12%2F1%2B20%2F1%2B30%2F1%2B42%2F1%2B56%2F1%2B72%2F1%2B90%2F1%E6%80%8E%E4%B9%88%E7%AE%97%3F%2F%E5%89%8D%E6%98%AF%E5%88%86%E6%AF%8D%2F%E5%90%8E%E6%98%AF%E5%88%86%E5%AD%90)
2/1+6/1+12/1+20/1+30/1+42/1+56/1+72/1+90/1怎么算?/前是分母/后是分子
2/1+6/1+12/1+20/1+30/1+42/1+56/1+72/1+90/1怎么算?/前是分母/后是分子
2/1+6/1+12/1+20/1+30/1+42/1+56/1+72/1+90/1怎么算?/前是分母/后是分子
1\2+1\6+……+1\90
=1-1\2+1\2-1\3+……+1\9-1\10
=1-1\10
=9\10
2/1+6/1+12/1+20/1+3011+42/1+56/1+72/1+90/1
=1-2/1+2/1-3/1+3/1-4/1+4/1-5/1+.......+9/1-10/1
=1-10/1
=10/9
方法:把6/1看成2/1-3/1,21/1看成3/1-4/1依次算就可以了
2/1+6/1+12/1+42/1+56/1+72/1先通分
再算20/1+30/1+90/1通分
最后加起来就好啦
原式就等于1-2/1+2/1-3/1+3/1-1/4+4/1-5/1+5/1-6/1+6/1-7/1+1/7-8/1+1/8-9/1=9/8
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=