天才们快来答 1.1/15+1/35+1/63+1/99+1/1432.252525*252252/525525*5252523.1\2+1\3+2\3+1\4+2\4+3\4+1\5+2\5+3\5+.+49\504.求(1/21+1\22+1/23+.+1\40)*5的整数部分是多少5.2*(1-1/1995的平方)*(1-1/1994的平方)*(1-1/1993的平方
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