1994+1/2-(1+1/3)+(2+1/2)-(3+1/3)+(4+1/2)-(5+1/3)+.+(1992+1/2)-(1993+1/3) 光写算式我看不懂.
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1/(2*2)+1/(3*3)+...+1/(1994*1994)和1993/1994比较大小
1/1994+2/1994+3/1994+····+1993/1994+1994/1994这道数学题咋么做?
巧算1/1994+2/1994+3/1994+……+1993/1994=()
(1+1/2+1/3+...+1/1994)*(1/2+1/3+...+1/1995)-(1+1/2+1/3+..+1/1995)*(1/2+1/3+...+1/1994)怎样算?
(1+1/2+1/3+...+1/1994)*(1/2+1/3+...+1/1995)-(1-1/2+1/3+..+1/1995)*(1/2+1/3+...+1/1994)怎样算?
1/1*2+1/2*3+1/3*4+...+1/1993*1994=
(1)1/1*2*3+1/2*3*4……+1/1993*1994*1995
2*(1-1/1995*1995)*(1-1/1994*1994)*(1-1993*1993)*.*(1-1/4*4)
当x=1+根号1994/2时,求(4x^3-1997x-1994)^2006
(1992/1993+1993/1994+1/2)*(1992/1993+1993/1994+1994/1995)-(1992/1993+1993/1994+1994/1995+1/2)*(1992/1993+1993/1994)
(1994+1992+1990...4+2)-(1+3+5+...+1993)
1997-1996+1995-1994+……-4+3-2+1
1-2+3-4+5-6.+1993-1994
(1+3+5+...+1995)—(2+4+6+...+1994)=?
计算1-2+3-4+5-.-1994+1995
把正有理数排序:1/1,2/1,1/2,3/1,2/2,1/3,4/1,3/2,2/3,1/4则数1995/1994
【1】(73+1/15)×1/8 【2】1/86+303/8686+9090/868686+13131313/86868686+1717171717/8686868686【3】1949×(1/4445-1/1994)+45×(1/1949-1/1994)-1994×(1/1949+1/45)+103
2*(1-1/(1995*1995))*(1-1/(1994*1994))*……*(1-1/(2*2)