启东作业本七年级上册数学
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设停电x小时 原长=L 粗的长度=（2-x）L/2 细的长度=（1-x）L/1 然后就有方程 （2-X）L/2=(1-X)Lx2解得x=1/3或设：停电X分钟 （1-1/120X)=2(1-1/60) X=40
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1/3小时
设停电x小时 原长=L 粗的长度=（2-x）L/2 细的长度=（1-x）L/1 然后就有方程 （2-X）L/2=(1-X)Lx2解得x=1/3
绛旓細鏍规嵁涓冨勾绾鏁欐潗瑕佹眰瀛︾敓鎳傚緱瑙傚療瑙勫緥锛屾墍浠ユ湁浠ヤ笅鍑犱釜鍏抽敭鐐癸細锛1锛夌敱宸茬煡|ab-2|涓巪b-1|浜掍负鐩稿弽鏁板緱锛殀ab-2|=0涓攟b-1|=0锛堥潪璐熸暟涓彧鏈0鐨勭浉鍙嶆暟鏄0锛夊嵆鍏堝緱b=1鍐嶅緱a=2锛涙墍浠ヤ唬鏁板紡鍖栦负锛1*2+2*3+3*4+4*5+鈥︹+2009*2010 =1*锛1+1锛+2*锛2+1锛+3*锛3+1锛+4*锛4+...
绛旓細60椤 12.瑙ｄ笅鍒楁柟绋嬶細1.x=7 2.x=3.5 13.瑙ｄ笅鍒楁柟绋嬶細1.x=涓冨垎涔嬪叚 2.x=-3 14.瀹屾垚涓嬮潰鐨勮В鏂圭▼锛屽苟鍦ㄦ嫭鍙蜂腑鎸囨槑璇ユ楠ょ殑渚濇嵁锛氳В鏂圭▼锛氣斺斺旇В锛氾紙鍘诲垎姣嶏級锛屽緱锛2锛2x+1锛-锛10x+1锛=6锛堢瓑寮忕殑鎬ц川2锛夊幓鎷彿锛屽緱锛4x+2-10x-1=6 锛堢Щ椤瑰悎骞讹級锛屽緱锛-6x=5 绯绘暟鍖栦负涓锛...
绛旓細浣滀笟44锛欳BBCD 6.浠庨《瑙掑嚭鍙戞妸杩欎釜瑙掑垎鎴愪袱涓浉绛夌殑瑙掔殑灏勭嚎 7. 3 2 涓夊垎涔嬩簩 涓夊垎涔嬩竴 8.15掳 30掳 9. 5 10.36掳108掳144掳 浣滀笟45锛欳ACDB 6.30 1:5 7.38掳37鈥 8.= 鍚岃鐨勪綑瑙掔浉绛 = 绛夎鐨勮ˉ瑙掔浉绛 9. 120 30 10.150掳11.45掳 16.315掳 45掳 鐪嬪湪鎴戜竴...
绛旓細a+b=6
绛旓細|ab-2|涓巪b-1|浜掍负鐩稿弽鏁,|ab-2|+|b-1|=0 寰梐b-2=0,b-1=0 a=2,b=1 1/ab+1/(a+1)(b+1)+1/(a+2)(b+2)+...+1/(a+2008)(b+2008)=1/1*2+1/2*3+...1/2009*2010 =1-1/2+1/2-1/3+1/3-1/4+...1/2009-1/2010 =1-1/2010 =2009/2010 ...
绛旓細b=-1 2.5 (15)(1)< < > > > > > (2)> (16)1(17)a=10 b=99 c c a b c 涔樻柟 涔橀櫎 鍔犳硶 鏈夋嫭鍙风殑瑕佸厛绠楁嫭鍙烽噷闈㈢殑 -2 -2 +3鎴-3 2 +5鎴-5 9鍒嗕箣4 -涓夊垎涔4 -9鍒嗕箣4 2 4 8 16 32 2 -7鍒嗕箣16 15鍙3鍒嗕箣2 ...
绛旓細14.锛1锛夌瓟锛氬畠浠箣闂寸殑璺濈鏄6鐨勯暱搴﹀崟浣嶃傦紙2锛塧=4锛宐=-4锛屾垨a=-4锛宐=4銆15.绛旓細鍙互婊¤冻鏉′欢鐐筆杩欐牱鐨勭偣鏈4涓16.锛1锛-2 2 锛2锛-a a 锛3锛夌瓟锛氭垜涓嶅悓鎰忋備緥瀛愶細锛1锛夊鏋渁鏄-1锛岄偅涔-a鏄1锛岃繖灏变笉鎴愮珛銆傦紙2锛夊鏋渁鏄0锛岄偅涔-a鏄0锛岃繖涔熶笉鎴愮珛銆
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绛旓細=锛1/1+1/2+鈥︹+1/9锛-锛2/1+2/2+鈥︹2/8锛+鈥︹+锛7/1+7/2+7/3锛-锛8/1+8/2锛+7/1 =45-18+鈥︹+7/6-8/3+7/1 =27+鈥︹+7/6-8/3+7/1 =54/1787
绛旓細璁剧敱鍖椾含鍒板ぉ娲ョ殑閫熷害涓篨锛岄偅涔堢敱澶╂触鍒板寳浜殑閫熷害涓篨+40锛岀敱浜庡寳浜埌澶╂触鐨勮窛绂绘槸鍥哄畾涓嶅彉鐨勶紝鎵浠ユ垜浠彲浠ュ垪鍑轰笅闈㈢殑绛夊紡锛36*X=30*锛圶+40锛夎В寰梄=200 2銆侊紙1锛夎В鏋:璁炬椿鍔ㄥ墠閿鍞殑鈪犲瀷鍜屸叀鍨嬪垎鍒负X,Y 閭ｄ箞锛屾椿鍔ㄥ悗鈪犲瀷鍜屸叀鍨嬬殑閿鍞噺鍒嗗埆涓猴細锛1+30%锛*X 銆侊紙1+25%锛*Y 鍒楀紡涓...
