2000*(1-1/2*)*(1-1/3)*...*(1-1999)*(1-1/2000)

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2000*(1-1/2*)*(1-1/3)*...*(1-1999)*(1-1/2000)

2000*(1-1/2*)*(1-1/3)*...*(1-1999)*(1-1/2000)
2000*(1-1/2*)*(1-1/3)*...*(1-1999)*(1-1/2000)

2000*(1-1/2*)*(1-1/3)*...*(1-1999)*(1-1/2000)
xny

2000*(1-1/2)*(1-1/3)*.*(1-1/1999)*(1-1/2000) 2000*(1-1/2*)*(1-1/3)*...*(1-1999)*(1-1/2000) (1/1+2)+(1/1+2+3)+…+(1/1+2+3…+2000) (1-1/2*2)(1-1/3*3)(1-1/4*4)……(1-1/2000 *2000)(1-1/2001*2001) 算(1/2+1/3+1/4+…+1//2000)(1+1/2+1/3+…+1/2001)-(1+1/2+1/3+1/4+…+1/2001)(1/2+1/3+…+1/2000 (1-1/2)*(1+1/2)*(1-1/3)*(1+1/3)*(1-1/4)*(1+1/4)*.*(1-1/2000)*(1+1/2000)求在半个小时之内解答! (1-1/2)×(1+1/2)×(1-1/3)×(1+1/3)×(1-1/4)×(1+1/4)×……接着上面:×(1-1/2000)×(1+1/2000) 2000-1990+1980-1970...+20-10/(1-1/2)(1-1/3).(1-1/10000) (1/2+1/3+...+1/2001)(1+1/2...+1/2000)-(1+1/2...+1/2001)(1/2+1/3+...+1/2001) (1-1/2²)(1-1/3²)...(1-1/1999²)(1-1/2000²) (1/2+1/3+.+1/2000+1/2001)-(1+1/2+1/3+..+1/2001)(1/2+1/3+...+1/2000)1/2000+1/2001)-(1+1/2+1/3+..+1/2001)(1/2+1/3+...+1/2000) 如何计算:(1-1/2*2)(1-1/3*3)(1-1/4*4)(1-1/5*5)、、、(1-1/2000*2000)拜托各位大神如何解(1-1/2*2)(1-1/3*3)(1-1/4*4)(1-1/5*5)、、、(1-1/2000*2000) (1-1/2)(1/3-1)(1-1/4)(1/5-1).(1-1/2000)(1/2000-1) (1-1/2)*(1-1/3)*(1-1/4)*.*(1-1/1998)*(1-/1999)*(1-1/2000)写出答案就行. 一道计算题,急需大神求解啊1/1+2+1/1+2+3+...+1/1+2+3+...+2000(1/1+2)+(1/1+2+3)+...+(1/1+2+3+...+2000). (1-2/1)+(2/1-3/1)+(3/1-4/1)+.+(1999/1-2000/1)计算 (1-1/2)+(1/2-1/3)+(1/3-1/4)+.+(1/1999-1/2000)= (1-1/2)+(1/2-1/3)+(1/3-1/4).+(1/1999-1/2000)