数学题目，急急急，求学霸啊啊啊，快啊，急！拜托
\u6570\u5b66\u9898\u76ee\uff0c\u6c42\u5b66\u9738\u554a\u554a\u554a\u7b2c\u4e00\u9898C
\u7b2c\u4e8c\u9898 a=1 a=-1
1)\u62bd\u6570\u636e−8\u30015\u30012\uff1b
(−8)\u00d75\u00d72=−80\uff1b
(2)\u62bd\u6570\u636e−8\uff1b−3\uff1b5\uff0c
−8\u00d7(−3)\u00d75=120.
系数分别是2，-1.2,1,-1，-2/3；次数分别是2，1，2，2，1。
能
理由 同位角相等的两条直线平行
绛旓細绛旀鏄細绯绘暟鍒嗗埆鏄2锛-1.2,1,-1锛-2/3锛涙鏁板垎鍒槸2锛1锛2锛2锛1銆
绛旓細瑙ｏ細3a2b锕2a2b锕ｏ紙2ab锕2锛夛梗4a2]锕b =3a2b锕2a2b+2ab锕2+4a2锕b =a2b+3a2+ab锛庡洜涓篴鏄粷瀵瑰肩瓑浜4鐨勬湁鐞嗘暟锛宐鏄掓暟绛変簬锕2鐨勬湁鐞嗘暟锛屾墍浠=4鎴栵梗4锛宐=锕2鍒嗕箣1锛庡綋a=4锛宐=锕2鍒嗕箣1鏃讹紝鍘熷紡=锕8+48锕2=38锛沘=锕4锛宐=锕2鍒嗕箣1鏃讹紝鍘熷紡=锕8+48+2=42锛庝竴姝...
绛旓細(1) y=(x^2-3x-4)^(-1/2)x^2-3x-4>0 (x+1)(x-4)>0 x<-1鎴栬厁>4 瀹氫箟鍩燂細(-鈭,-1)U(4,+鈭)(2) y=(2x^2-x-1)^(-2)2x^2-x-1鈮0 (2x+1)(x-1)鈮0 2x+1鈮0 x=-1/2 鎴栬厁-1鈮0 x鈮1 瀹氫箟鍩燂細(-鈭,-1/2)U(-1/2,1)U(1,+鈭)(3) y=鈭(...
绛旓細褰揳=2,b=3鏃 a^2-2ab+b^2 =2^2-2*2*3+3^2 =4-12+9 =1 (a-b)^2 =(2-3)^2 =(-1)^2 =1 褰揳=5,b=-3 a^2-2ab+b^2 =5^2-2*5*(-3)+(-3)^2 =25+30+9 =64 (a-b)^2 =[5-(-3)]^2 =8^2 =64 3)鏍规嵁锛1锛夈侊紙2锛夌殑璁＄畻缁撴灉,a^2-2ab+b^...
绛旓細鍥
绛旓細15.(1) 10 (2)涓夎竟閮戒负6 (3) 7鍜7鎴6鍜8 (4) 5鍜5鍜2 锛5锛3鍜3鍜2
绛旓細鏈鏄吀鍨嬬殑涓嶅姩鐐硅В娉 浠=锛坸+1锛/12x銆傝В寰梮=1/3,鎴-1/4,锛坅n+1-1/3锛=(an+1)/12an-1/3=-3锛坅n-1/3锛/12an 锛坅n+1+1/4锛=(an+1)/12an+1/4=4锛坅n+1+1/4锛/12an 鍗筹紙an+1-1/3锛/锛坅n+1+1/4锛=-3锛坅n-1/3锛/4锛坅n+1/4锛夎Cn=锛坅n-1/3锛/...
绛旓細(x^2 -4x+4)-4 +y^2+1=0 (x-2)^2 +y^2=3 鏁 (x-2)^2鈮3锛寉^2鈮3 鍗 2-鈭3鈮鈮2+鈭3锛 -鈭3鈮鈮も垰3 鎵浠 :鏈灏忓兼槸(2-鈭3+2)^2 -5=(4-鈭3)^2 -5=14-8鈭3 鏈澶у兼槸(2+鈭3+2)^2 -5=14+8鈭3 涓嶆眰閫熷害锛屼絾姹傝川閲忥紝鏀惧績閲囩撼锛屾杩庤拷闂 ...
绛旓細绛旀鏄91 瑙ｇ瓟濡備笅锛氳鍙樼浉鍚岀殑鏁颁负X锛屽垯鏈夛細A=X+25 B=X-17 C=X/3 D=2X 浠庤屽緱锛歑+25+X-17+X/3+2X=73.5脳4 瑙ｅ緱锛歑=66 A=66+25=91
绛旓細(1)銆3*10^5 * (8*60+18) = 1.494*10^8 km (2)銆3*10^5 * 2.56/2 = 3.84 * 10^5 km
