2/3*5+2/5*7+2/7*9+2/9*11+…2/99*101
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2/3*5+2/5*7+2/7*9+2/9*11+…2/99*101
2/3*5+2/5*7+2/7*9+2/9*11+…2/99*101
2/3*5+2/5*7+2/7*9+2/9*11+…2/99*101
2/3*5+2/5*7+2/7*9+2/9*11+…2/99*101
=(1/3-1/5)+(1/5-1/7)+……+(1/99-1/101)
=1/3-1/101
=98/303
2/3*5+2/5*7+2/7*9+2/9*11+…2/99*101
=(1/3-1/5)+(1/5-1/7)+(1/9-1/11)+....+(1/99-1/101)
=1/3-1/101
=98/303
2/3*5+2/5*7+2/7*9+2/9*11+…2/99*101
=2*(1/3*5+1/5*7+1/7*9+1/9*11+...+1/99*101)
=2*(1/3-1/5+1/5-1/7+1/7-1/9+1/9-1/11+...+1/99-1/101)
=2*(1/3-1/101)
=2*98/303
=196/303
-|-2/3-(+2/3)|-|(-1/5)+(-2/5)| |4/7-2/5|-|3/5-7/9|+|2/9-3/7|
2/3*5+2/5*7+2/7*9+2/9*11+...+2/99*101
2/3*5+2/5*7+2/7*9+2/9*11+…2/99*101
2/3+2/3*5+2/5*7+2/7*9+2/9*11+2/11*13简算
1+9+7+3+5+2/2+9/91
3×5/2+5×7/2+7×9/2+……+99×101/2 简便运算
5,3,7/3,2,9/5,5/3,7/3是3分之7
5/9+2/7-5/9+5/7简便计算
9/5×7/2×10/7 求
2+2+2+5+8+4+7+5+9+5
5 5 9 9 7 7 7 7 3 3 8 8 9 9 9 9 3 5 10 10 9 2 7 8 2 3 5 10 2 7 7 9怎么算出24?
2+3,2+3+5,2+3+5+7,2+3+5+7+9通项公式
|2 -5 1 2| |-3 7 -1 4| |5 -9 2 7| |4 -6 1
2-2^2-2^3-2^4-2^5-2^6-2^7-2^8-2^9+2^10
简算2/(3*5)+2/(5*7)+2/(7*9)+2/(9*11)+……+2/(99*101)
2/5+2/9+7/45等于?
(2/7+3/2)÷9/49-1,5
5/2,10/9,15/7 5/3,2/1,7/5 从小到大排顺序