1/1*3=1/2(1/1-1/3)
1/3*5=1/2(1/3-1/5)
...
1/1*3+1/3*5+1/5*7+.+1/97*99
=1/2(1/1-1/3+1/3-1/5+.+1/97-1/99)
=1/2*98/99
=49/99
1/1*3 + 1/3*5 + 1/5*7 + …… + 1/97*99
2个回答
相关问题
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