4/25(1/1*5+1/5*9+1/9*13.1/97*101)多少?

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4/25(1/1*5+1/5*9+1/9*13.1/97*101)多少?4/25(1/1*5+1/5*9+1/9*13.1/97*101)多少?4/25(1/1*5+1/5*9+1/9*13.1/97

4/25(1/1*5+1/5*9+1/9*13.1/97*101)多少?
4/25(1/1*5+1/5*9+1/9*13.1/97*101)多少?

4/25(1/1*5+1/5*9+1/9*13.1/97*101)多少?
4/25(1/1*5+1/5*9+1/9*13.1/97*101) =4/25*(1-1/5+1/5-1/9+.+1/97-1/101)/4 =1/25*(1-1/101) =1/25*100/101 =4/101