七年级上启东中学数学作业31答案
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2、C
3、D
4、B
5、3
6、12,14,16
7、3168Km
8、13、14、15
9、-8
10、（1）-12 （2）五分之十六
11、（1）x=7 （2）x=5
12、（1）x=5 (2)x=5
13、当a=11时，二分之a+1 —三分之5—a>8
14、y=5
15、x=四分之三
绛旓細2銆丆 3銆丏 4銆丅 5銆3 6銆12,14,16 7銆3168Km 8銆13銆14銆15 9銆-8 10銆侊紙1锛-12 锛2锛変簲鍒嗕箣鍗佸叚 11銆侊紙1锛墄=7 锛2锛墄=5 12銆侊紙1锛墄=5 (2)x=5 13銆佸綋a=11鏃讹紝浜屽垎涔媋+1 鈥斾笁鍒嗕箣5鈥攁>8 14銆亂=5 15銆亁=鍥涘垎涔嬩笁 ...
绛旓細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P15 涓銆丅BADC 浜屻6銆侊紙1锛101锛+锛-5锛... (2)-4.3,-3/5,-0.01001,-|3/4|,+(-5)... (3)-4.3,-3/5,-(-22/7),-0.01001,-|+3/4|... (4锛墊0|... 7銆1锛-1锛0锛0锛0锛涙病鏈夛紱+1鎴-1 8銆<;<;>;>;> 9銆0;4;< 10銆2013 ...
绛旓細瑙ｏ細杩嘙鍋欰B骞宠绾縀F锛堜綔鍥撅級鍥犺B=80搴︼紙宸茬煡锛夋墍瑙払ME=100搴︼紙涓ょ洿绾垮钩琛岋紝鍚屾梺鍐呰浜掕ˉ锛夊張鍥犺BMD=30搴︼紙宸茬煡锛変笖瑙扗ME=瑙払ME+瑙払MD=100+30=130 鍥燗B//CD锛堝凡鐭ワ級鎵EF//CD(A//B,A//C,鍒橝//C)鍥犺DME=130搴︼紙宸茶瘉锛夋墍瑙扗=180-瑙扗ME=180-130=50(涓ょ洿绾垮钩琛岋紝鍚屾梺鍐呰浜掕ˉ)...
绛旓細(1锛塧=4锛宐=-2 a+b=2 (2)a=4 b=2 a+b=6
绛旓細鍚笢涓浣滀笟鏈7骞寸骇鏁板(涓婂鏈) 鎴戞潵绛 2涓洖绛 #璇濋# 鎵撳伐浜虹殑鈥滄儴鈥濊皝鏄姜榄佺ジ棣?鍖垮悕鐢ㄦ埛 2014-09-11 灞曞紑鍏ㄩ儴 鏈洖绛旂敱鎻愰棶鑰呮帹鑽 宸茶禐杩 宸茶俯杩< 浣犲杩欎釜鍥炵瓟鐨勮瘎浠锋槸? 璇勮 鏀惰捣 鍖垮悕鐢ㄦ埛 2014-09-11 灞曞紑鍏ㄩ儴 宸茶禐杩 宸茶俯杩< 浣犲杩欎釜鍥炵瓟鐨勮瘎浠锋槸? 璇勮 鏀惰捣 ...
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|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=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...
