1988+1987-9-1985+1984+1983-1982-1981+…+1
简便计算:1988+1987-1986-1985+1984+1983-1982-1981+……+2-1
x=1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 198
计算1989+1988+1987-1986-1985-1984+1983+1982+1981-1980-1979-197
1989+1988+1987-1986-1985-1984+1983+1982+1981-1980-1979-1978+
(1988+1986+1984+…+6+4+2)-(1+3+5+…+1983+1985+1987)
1989+1988+1987-1986-1985-1984+1983+1982+1981-.+9+8+7-6-5-4+3
1981×1982×1983×1984×1985×…×2005积的末尾有多少个零
计算(1988+1986+1984+...+6+4+2)-(1+3+5+...+1983+1985+1987)
1983+1985+1987……+1999/1984+1986……+2000大神们帮帮忙
1/1980+1/1981+1/1983+1/1984+1/1985=?
简便计算1+2-3-4+5+6-7-8+...+1982-1983-1984+1985
1+2-3-4+5+6-7-8+9+10……+1985+1986-1987-1988+1989+1990=_______