(1985+1987+1989+...+1999)/(1986+1988+1990...+2000)
(1985+1987+1989+...+1999)/(1986+1988+1990...+2000)
1986+1988+1990+...+2000分之1985+1987+1989+...+1999
(1985+1987+1989+...+1999)/(1986+1988+1990+...
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=
99999²+199999 1986+1988+1990+…+2000分之1985+1987+1989+…+1
1986+1987+1988+K+2000分之1985+1986+1987+∧+1999计算过程 可以简便要简便
1+2-3-4+5+6-7-8+9+10-.+1985+1986-1987-1988+1989+1990=( )
计算1989+1988+1987-1986-1985-1984+1983+1982+1981-1980-1979-197