20/1+30/1+42/1+56/1+72/1+90/1救简算
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20/1+30/1+42/1+56/1+72/1+90/1救简算
20/1+30/1+42/1+56/1+72/1+90/1救简算
20/1+30/1+42/1+56/1+72/1+90/1救简算
是1/20吧 原式=1/2*(1/10+1/15+1/21+1/18+1/36+1/45)=1/2*《1/(1+2+3+4)+1/(1+2+3+4+5)+.+1/(1+2+3+4+5+6+7+8+9)》=1/2*2*(1/4-1/5+1/5-1/6+...1/9-1/10)=1/4-1/10=3/20
1/20+1/30+1/42+1/56简便计算,
1/20+1/30+1/42+1/56=1/20+1/30+1/42+1/56=
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
1/2+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,
1/12+1/20+1/30+1/42+1/56+1/72+1/90
简便运算:1/2+1/6+1/12+1/20+1/30+1/42+1/56
2/1+6/1+12/1+20/1+30/1+42/1+56/1=?
1/12+1/20+1/30+1/42+1/56+1/72+1/90
1/6+1/12+1/20+1/30+1/42+1/56+1/72 简便计算
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+1/42+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=
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
1/2+1/6+1/12+1/20+1/30+1/42+1/56