已知M={1,2,3,4,5,6,7,8,9},集合P满足:P是M的子集且若α∈P,则10-α∈P,则集合P有多少个 2.{（a,b）}和{（b,a）}是什么关系用什么符号表示

已知m＞4,化简|m-4|+|7-2m|+|m×m-2m+1|-|m×m-2m-3| m-2m-3m+4m-5m-6m+7m.2004m=? m-2m-3m+4m-5m-6m+7m-8m-9m+...+2002m-2003m-2004m求m的值 已知2^m=a,化简16×2^2m-1 ×2^3m-1 -4^m ×8^m 已知2^m=a,化简16×2^2m-1 ×2^3m-1 -4^m ×8^m 已知m^2+m-1=0,那么m^4+2m^3-m-2009= 已知m+1/m=3,计算(m^4+m^2+1)/m^2的值 已知m>4,化简:|m-4|+|7-2m|+|m^2-2m+1|-|m^2-2m-3| (m+3m+5m+7m+.+2009m)-(2m-4m-6m-.-2008m)=? 计算：m-2m-3m+4m-5m-6m+7m-8m-9m+...+2002m-2003m-2004m m-2m-3m+4m-5m-6m+7m-8m-9m+.+2002m-2003m-2004m 已知5^m=6 ,7^m=8 ,求 35^2m的值. 已知4^m=6,8^n=2,求2^2m-3n+1 已知m=1/2,n=1/8,求m-n/根号m-根号n+m+9n-6根号mn/根号m-3根号n-m根号m+n根号n/m-根号mn+n的值快速第二题7根号a+5根号a²-4根号b²/a-6根号b²x/9(b 已知m-1/m=3,m不等于0,求m^2-1/m^2,m^3-1/m^3,m^4-1/m^4 已知m^2-5m+1=0,求m^3+1/m^3 和m-1/m的值 已知C(m+1) 7+C(m+1) 8=C(m+2) 3 ,则m= 已知3m^2-5m-1=0,则6m^2-10m+2=