x=1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 198

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 03:40:29

x=1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008.
y=139578.78+136456.89*@cos(0.065646714*x-1.279387)
怎样求出这些y呀
这样的代码为什么不行呀
model:
sets:
years /1..31/:x;
endsets
data:
x=1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008;
enddata
y=139578.78+136456.89*@cos(0.065646714*x-1.279387)
end

仅仅要求出这些y吗?
那么先定义集再求就好了这样做
sets:
a/1..31/:x,y;
endsets
data:
x=1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008;
enddata
calc:
@for(a:y=139578.78+136456.89*@cos(0.065646714*x-1.279387));
endcalc

x=1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 198 已知想x^4+x^3+x^2+x+1=0求x^1988+x^1987+x^1986= 已知想x^4+x^3+x^2+x+1=0求x^1989+x^1988+x^1987+x^1986= 1989+1988+1987-1986-1985-1984+1983+1982+1981-1980-1979-1978+ 已知x^2+x+1=0,求x^1987+x^1988+...+x^2001的值若x=1/1/1980+1/1981+1/1982+...+1/1987则x整数部分是多少计算1989+1988+1987-1986-1985-1984+1983+1982+1981-1980-1979-197 如果x=1/(1/1980+1/1981+1/1982+...+1/1998+1/1999),求x的整数部分. 1x()+2x()+3x()+4x()+5x()+6x()+7x()+8x()加9x()+10x()=1980 1X?+2X?+3X?+4X?+5X?+6X?+7X?+8X?+9X?+10X?=1980求?是多少已知x²+x+1=0.求x的1987次方+x的1988次方`````+x的2001次方.的值（X+X)+(X-X)+(X*X)+(X/X)=100