(1985+1987+1989+...+1999)/(1986+1988+1990+...
来源:学生作业帮 编辑:百度作业网作业帮 分类:综合作业 时间:2024/04/29 09:53:54
(1985+1987+1989+...+1999)/(1986+1988+1990+...
(1985+1987+1989+...+1999)=(1985+1999)+(1987+1997)+(1989+1995)+(1991+1993)
=8×1992
(1986+1988+1990+...+2000)=(1986+2000)+(1988+1998)+(1990+1996)+(1992+1994)
=8×1993
(1985+1987+1989+...+1999)/(1986+1988+1990+...+2000)
=(8×1992)/(8×1993)
=1992/1993
=8×1992
(1986+1988+1990+...+2000)=(1986+2000)+(1988+1998)+(1990+1996)+(1992+1994)
=8×1993
(1985+1987+1989+...+1999)/(1986+1988+1990+...+2000)
=(8×1992)/(8×1993)
=1992/1993
(1985+1987+1989+...+1999)/(1986+1988+1990+...
1986+1988+1990+...+2000分之1985+1987+1989+...+1999
(1985+1987+1989+...+1999)/(1986+1988+1990...+2000)
数学题(1985+1987+1989+1991+.+1999)/(1986+1988+1990+.+2000)= 多少
分数简便运算1985+1987+1989+.1999/1986+1988+1990+.2000
1985+1987+1989+.+1999/1986+1988+1990+.+2000怎么算简便要特别简便,急、
1985/1986+1987/1988+1989/1990+...+1999/2000怎样简算拜托各位了 3Q
1985+1987+1989+……+1999/1986+1988+1990+……+2000=
1+2-3-4+5+6-7-8+9+10-.+1985+1986-1987-1988+1989+1990=( )
99999²+199999 1986+1988+1990+…+2000分之1985+1987+1989+…+1
1/1986*1987+1/1987*1988+1/1988*1989+1/1989*1990+1/1990=?
(1990的2次方+1988的2次方+1986的2次方.+2的2次方)-(1989的2次方+1987的2次方+1985的