急！初二数学实数的几道题！请帮个忙！拜托了！
\u8fd9\u662f\u4e00\u9053\u521d\u4e8c\u5f97\u6570\u5b66\u9898\u3001\u6025\u6c42\u89e3\u3001\u3001\u62dc\u6258\u4e86\u3001\u5e2e\u4e2a\u5fd9\uff01\u9898\u76ee\u5185\u5bb9\uff1a\u6709\u4e00\u7fa4\u871c\u8702\u3001\u5176\u534a\u6570\u7684\u5e73\u65b9\u6839\u98de\u5411\u8309\u8389\u82b1\u4e1b...\u89e3\uff1a\u8bbe\u8702\u7fa4\u4e2d\u6709x\u53ea\u871c\u8702\uff0c
\u5217\u51fa\u65b9\u7a0b\uff1ax-[\u221a(x/2)]-(8x/9)=2
\u5316\u7b80\uff1ax/9-2=\u221a(x/2)
\u89e3\u5f97\uff1ax=72 \u6216x=9/2
\u7ecf\u68c0\u9a8c\uff0c\u4e24\u6839\u90fd\u662f\u539f\u65b9\u7a0b\u7684\u6839\uff0c\u4f46x=9/2\u4e0d\u5408\u9898\u610f\uff0c\u820d\u53bb
\u7b54\uff1a\u8702\u7fa4\u4e2d\u670972\u53ea\u871c\u8702\u3002
\u5728\u6b63\u65b9\u5f62ABGF\uff0c
AF=AB\uff0c
\u2220FAB=90\u00b0\uff0c
\u53c8\u5728\u6b63\u65b9\u5f62ACDE\uff0c
AE=AC\uff0c
\u2220EAC=90\u00b0\uff0c
\u2234\u2220FAB=\u2220EAC=90\u00b0\uff0c
\u2235\u2220FAC=\u2220FAB+\u2220BAC\uff0c
\u2220EAB=\u2220EAC+\u2220BAC\uff0c
\u2234\u2220FAC=\u2220EAB\uff0c
\u2234\u25b3FAC\u224c\u25b3EAB\uff0c
\u2234BE=CF
\u25b3FAC\u548c\u25b3EAB \u65cb\u8f6c\u89d2\u4e3a\u2220FAE \u2220CAE \u65cb\u8f6c\u4e2d\u5fc3\u4e3a\u70b9A
\u671b\u91c7\u7eb3\u3001\u3001\u3001
0.05
22.36
2.646
8.718
0.01354
7
2400
0.05
22.36
根号7
2根号19
0.01354
7
绛旓細2:浠呭綋a=-1寮忓瓙鎵嶆湁鎰忎箟銆傛晠a鐨勪釜鏁版槸锛 1 锛3锛氫笌鈭270鏈鎺ヨ繎鐨勬暣鏁版槸锛16锛夊洜涓16=鈭256<鈭270<鈭289=17 4:鐢遍鐭+3=15-2a寰梐=4锛屾晠骞虫柟鏍筧+3=7鎴2a-15=-7锛岄偅涔堣繖涓暟绛変簬锛49 锛5锛氬綋X锛 =-1 锛夋椂锛屾牴鍙稾+1鍒嗕箣4鏃犳剰涔夛紝鍥犱负鍒嗘瘝涓洪浂 6锛氣垰a+1 +2鐨勬渶...
绛旓細14銆佽繖棰樻墦鍗伴敊浜嗭紝鍏朵腑涓涓獂搴旇鍐欐垚y锛屼笉璁烘槸鍝釜缁撴灉閮戒竴鏍枫傜敱棰樻剰鐭ワ紝3鈭氾紙3x-7锛=-3鈭氾紙3y+4锛夆埓3x-7=-(3y+4)绉婚」锛屽緱3x+3y=3 鈭磝+y=1 瑕佸浼氬埄鐢ㄧ粷瀵瑰煎拰鏃犵悊寮忕殑鎬ц川鍟婏紝鍙鐭ラ亾寮忓瓙閲岀殑缁撴灉涓瀹氳澶т簬绛変簬0锛屽墠涓閬撻灏变細鍋氫簡銆傜涓夐瑕佺煡閬擄紝绛夊紡涓よ竟绔嬫柟鍚庝緷鐒舵垚绔嬨
绛旓細涓涓姝ｆ暟鐨勪袱涓钩鏂规牴鏄浉鍙嶆暟 鎵浠2m-1=-(4-3m)2m-1=3m-4 m=3 杩欎釜姝ｆ暟鏄(2m-1)²=25
绛旓細1銆佹牴鍙48-鏍瑰彿3梅鏍瑰彿3 =4鈭3-1.2.3鏍瑰彿12-鏍瑰彿锛1/27锛=6鈭3-锛堚垰3锛/9 =锛53/9锛夆垰3.3.鏍瑰彿24-鏍瑰彿锛2/3锛-鏍瑰彿锛3/2锛=2鈭6-锛堚垰6锛/3-锛堚垰6锛/2 =锛7/6锛夆垰6.4.鏍瑰彿銆-5銆慯2+涓夋鏍瑰彿銆-5銆慯3 =5-5=0.5.銆愭牴鍙3+2銆戙2-鏍瑰彿3銆=4-3=1.6.鏍瑰彿24+...
绛旓細1.鍒嗘瀽闆ㄦ楂樺害涓轰竴涓鍗婂緞鍔3涓100涓鸿竟鐨勭瓑杈逛笁瑙掑舰鐨勯珮 50+3*鏍瑰彿涓媅10000-2500]=50+3*鏍瑰彿涓7500 2.1500*18.4=27600 1500*20.8=42000 150鐨勫钩鏂=22500 170鐨勫钩鏂=28900 鎵浠ヨ 浠嬩簬瀹冧滑闂寸殑鏄數鍣ㄤ箼 銆傛湜閲囩撼
绛旓細1.灏鸿浣滃浘锛熶互锛0锛1锛変负鍦嗗績锛2涓哄崐寰勪綔鍦嗭紝涓嶺杞翠氦鐐瑰氨鏄牴鍙3锛屾牴鍙5鍦紙0锛2锛変綔鍗婂緞3鐨勫渾銆2.x^2+y^2-2xy-14x+14y+49=(y-x+7)^2=0,y=x-7,2x-3y+5=0 x=26,y=19 x^2-y^2=315
绛旓細1锛屼竴涓暟鐨骞虫柟鏍癸紝浜掍负鐩稿弽鏁帮紝鈭碼+3=15-2a 3a=12 a=4 2锛屸埖b鐨勭畻鏈钩鏂规牴涓19 鎵浠=19²=361 鈭 c鐨勫钩鏂规牴鏄璐3 鈭碿=9 2c=18 鎵浠ュ師寮=361=a³+18 a³=343 鎵浠=7
绛旓細鈭2鍜屸垰3杩樻湁pai鍘昏繎浼煎硷紙鎴戝ソ鍍忓繕浜嗚繎浼煎兼槸澶氬皯锛岃鍘熻皡鍝︼紝涓嶈繃浣犱滑鐨鏁板涔︿笂搴旇鏈夛紝鎴栬呬篃鏈変簩娆℃牴寮忕殑杩戜技鍊煎彇娉曪紝浣犵炕缈荤湅鍚э級5 鍒嗘瀽锛氬綋x锛2鏄 鍘熷紡锛濓紙1#2锛夛紞锛3#2锛夊洜涓1灏忎簬2锛屽睘浜巃灏忎簬b鍨 鎵浠1#2锛1 鍥犱负3澶т簬2锛屽睘浜巃澶т簬绛変簬b鍨 鎵浠3#2锛2鐨勫钩鏂癸紳4 鎵浠ュ師寮忥紳1锛...
绛旓細宸茬煡a灏忎簬0 b灏忎簬0 姹4涔樹互a鐨勫钩鏂癸紜12ab锛9涔樹互b鐨勫钩鏂圭殑绠楁湳骞虫柟鏍 鏍瑰彿涓嬶紙4a^2+12ab+9b^2)=鏍瑰彿涓((2a+3b)^2)鍥犱负2a+3b<0 鎵浠ュ師寮=-2a-3b 鑻2m锛2鐨勫钩鏂规牴鏄璐4锛3mn锛媙锛1鐨勫钩鏂规牴鏄璐5 杩檓 n 鐨勫间负澶氬皯 鍥犱负2m锛2鐨勫钩鏂规牴鏄璐4 鎵浠2m锛2涓4^2=16 鎵浠=7...
绛旓細1.3鈭氾紙1/6锛-4鈭氾紙50锛+30鈭氾紙2/3锛 绛旀3鈭氾紙1/6锛-4鈭氾紙50锛+30鈭氾紙2/3锛 = 3脳鈭6/6-4脳5鈭2+30脳鈭6/3 锛濃垰6/2-20鈭2+10鈭6 2. 锛1-鏍瑰彿2锛/2涔樹互锛1锛嬫牴鍙2锛夛紡2 棰樻槸杩欐牱鐨勪簩鍒嗕箣涓鍑忔牴鍙2涔樹互浜屽垎涔嬩竴鍔犳牴鍙2 绛旀锛氾紙1-鏍瑰彿2锛/2涔樹互锛1锛嬫牴鍙2锛夛紡...
