SOS已知|2004-a|+√a-2005=a,则a减去2004的平方的值为多少

SOS已知|2004-a|+√a-2005=a,则a减去2004的平方的值为多少 SOS! 已知集合A={X/-3 已知：a+b+c=0 求.SOS! eat of sweets a lot not do(.)连词成句sos sos sos sos sos!help!help!若a SOS!已知a>0,b>0,c>0,a^2=b(b+c),b^2=c(a+c).求c/a+c/b的值.求c/a+c/b的值（正确答案是1!)SOS!SOS!SOS!SOS!SOS!SOS!有的同学这样写，我没看懂，求指教，(a^2/b)x(b-c)=aca^2-(a^2)c/b=ac1-c/b=c/ac/a+c/b=1只是这道题前面还有 sinA=0.3108,A=?SOS! SOS设A=={x｜-1 SOS 急ax2(平方)-2x+a there is a lot of snow today.（改为同义句）it's__________today.excuse me ,please help me .thank you very much!sos sos sos sos sos 已知a-b=3,b+c=-5,求代数式ac-bc-a²-ab的值.SOS啊 在三角形ABC中,已知COS A=3/5,SOS B=5/13.求COS C=? 计算,化简SOS计算1/a(a+1)+1/(a+1)(a+2)+1/(a+2)(a+3)+.+1/(a+2004)(a+2005) 已知非零向量a,b,求证:|a+b|=|a-b|成立的充要条件是a的方向与b的方向垂直.证明急.SOS! small,white flower,With six sharp angles,Floating from the heaven,Blooming in the winter,What is itlt's a riddle Help us!SOS!SOS!SOS!SOS!SOS!SOS! 高一喊数问提SOS已知0 sos,uFo,cctv,apc,wto,msn,a.m. I had a fever yesterday怎么问快,SOS