1994+1/2-(1+1/3)+(2+1/2)-(3+1/3)+(4+1/2)-(5+1/3)+.+(1992+1/2
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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.
1994+1/2-(1+1/3)+(2+1/2)-(3+1/3)+(4+1/2)-(5+1/3)+.+(1992+1/2)-(1993+1/3)
=-(1+1/3)+(2+1/2)-(3+1/3)+(4+1/2)-(5+1/3)+.+(1992+1/2)-(1993+1/3)+(1994+1/2)
=-1-1/3+2+1/2-3-1/3+4+1/2-5-1/3+.+1992+1/2-1993-1/3+1994+1/2
=(-1+2-3+4-5+…+1992-1993+1994)+(-1/3+1/2-1/3+1/2-1/3+…+1/2-1/3+1/2)
=【(-1+2)+(-3+4)+…+(-1993+1994)】+(-1/3-1/3-…-1/3)+(1/2+1/2+…+1/2)
=1994/2+(-1/3)*(1994/2)+(1/2*1994/2)
=997-997/3+997/2
=1163又1/6.
=-(1+1/3)+(2+1/2)-(3+1/3)+(4+1/2)-(5+1/3)+.+(1992+1/2)-(1993+1/3)+(1994+1/2)
=-1-1/3+2+1/2-3-1/3+4+1/2-5-1/3+.+1992+1/2-1993-1/3+1994+1/2
=(-1+2-3+4-5+…+1992-1993+1994)+(-1/3+1/2-1/3+1/2-1/3+…+1/2-1/3+1/2)
=【(-1+2)+(-3+4)+…+(-1993+1994)】+(-1/3-1/3-…-1/3)+(1/2+1/2+…+1/2)
=1994/2+(-1/3)*(1994/2)+(1/2*1994/2)
=997-997/3+997/2
=1163又1/6.
1994+1/2-(1+1/3)+(2+1/2)-(3+1/3)+(4+1/2)-(5+1/3)+.+(1992+1/2
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
1994-1993+1992+1991-1990+1989+1988-1987+.+5-4+3+2-1=
1+2+3+4-5-6-7-8+9+10.-1992+1993+1994+1995+1996
(2+4+6+…+1992+1994)—(1+3+5+…+1991+1993)=?
1994-1993+1992+1991-1990.+5-4+3+2-1=
1+2-3+4-5+6-7+8-9+10-11+.+1992-1993+1994等于多少
1992 2/1-1 3/1+2 2/1-3 3/1-------1990 2/1-1991 3/1=?
1994+1/2-1又1/3+2又1/2-3又1/3+4又1/2-.+1992又1/2-1993又1/3如何简算?
1994+2分之1-1又3分之1+2又2分之1…1992分之2分之1-1993又3分之1
(1+1/2+1/3+1/4+1/5)*(1/3+1/4+1)-(1+1/3+1/4)*(1/2+1/3+1/4+1/5
提问题(1+1/2+1/3+1/4)×(1/2+1/3+1/4+1/5)-(1/2+1/3+1/4)×(1+1/2+1/