请帮我回答几道奥数题,请帮我回答几道奥数题,1.1/2(二分之一)+5/6+11/12+19/20+29/30+.+9701/9702+9899/99002.(1+2/5)*(1-2/5)*(1-2/7)*.*(1+2/2005)8(1-2/2005)3.1+1/2+(1/3+2/3)+.+(1/50+2/50+3/50+...+49/50)4.(1+1/2)*(1-1/2)*.*(1+1/9

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