初中数学，15，16题，大侠帮帮忙，感激不尽！！！
\u521d\u4e2d\u6570\u5b66 \u7b2c15\u548c\u7b2c\u5341\u516d\u9898 \u9ad8\u624b\u5e94\u8be5\u80fd\u770b\u61c2\u539f\u56fe\u2026\u6c42\u521d\u4e2d\u6570\u5b66\u5927\u795e.
\u63d0\u793a\uff1a\u5982\u56fe\uff0c
1\u3001\u4f5c\u5bf9\u79f0\u70b9\uff1b
2\u3001\u6700\u77ed\u8def\u5f84\u95ee\u9898\uff1a\u4e24\u70b9\u4e4b\u95f4\u7ebf\u6bb5\u6700\u77ed\uff1b
3\u3001\u70b9\u5230\u76f4\u7ebf\u7684\u8ddd\u79bb\uff08\u5782\u7ebf\u6bb5\u6700\u77ed\uff09\uff1b
4\u3001CM+MN=CN\u2018=C\u2019N=2+1=3
16\u9898\uff0c\u25b3GEF\u7684\u9762\u79ef\u7684\u6700\u5927\u503c\u4e3a20/3.
\u63d0\u793a\uff1a\u5982\u56fe\uff0c\uff08\u65b9\u6cd5\u4e0d\u552f\u4e00\uff09\u4f5c\u5782\u7ebf\u6bb5EH\uff0c\u5782\u8db3\u4e3aH\uff1b
1\u3001\u6613\u8bc1Rt\u25b3EFH\u224cRt\u25b3EFB\uff0cRt\u25b3EGH\u224cRt\u25b3EGA\uff1b\uff08\u4e5f\u53ef\u770b\u505a\u5bf9\u79f0\uff09
\u2234\u25b3GEF\u7684\u9762\u79ef=\u25b3EBF\u7684\u9762\u79ef+\u25b3EAD\u7684\u9762\u79ef\uff1b
2\u3001\u2235EH=EB=EA=4/2=2\uff0c\uff08E\u662f\u4e2d\u70b9\uff09
\u2234\u25b3GEF\u7684\u9762\u79ef=1/2DF\u00d7EH =1/2\u00d72\u00d7DF=DF\uff1b
\u5373 \u25b3GEF\u7684\u9762\u79ef\u7531\u4e09\u89d2\u5f62\u7684\u5e95\u548c\u9ad8\u51b3\u5b9a\uff0c\u9ad8\u662f\u5b9a\u503c\uff0c
\u2234 \u25b3GEF\u7684\u9762\u79ef\u5927\u5c0f\u4e0eDF\u7684\u957f\u6210\u6b63\u6bd4\u4f8b\uff0c
\u5f53G\u8fd0\u52a8\u5230\u4e0e\u70b9D\u91cd\u5408\u65f6\uff0cDF\u6709\u6700\u5927\u503c\uff1b
3\u3001\u6613\u8bc1\u25b3EBF\u223d\u25b3DAE\uff0c\u8bbeBF=x\uff0c\u6709
BF\uff1aAE=BE\uff1aAG
x\uff1a 2=2\uff1a6
x=2/3
4\u3001 \u2234\u25b3GEF\u7684\u9762\u79ef=\u25b3EBF\u7684\u9762\u79ef+\u25b3EAD\u7684\u9762\u79ef
=1/2BE\u00d7BF+1/2AE\u00d7AD
=2/3\u00d72\u00f72+2\u00d76\u00f72
=20/3
13.\u56e0\u4e3aAB\u6bd4BC\u6bd4CD=2\u6bd43\u6bd44\uff0c\u6240\u4ee5AC\u5c31\u53602\uff0b3=5\u4efd\uff0c20\u00f75=4\uff08\u6bcf\u4efd\u662f4\uff09\uff0c\u6240\u4ee5DC=4\u4e584=16
15.\u6211\u89c9\u5f97\u9898\u662f\u4e0d\u662f\u9519\u4e86\uff0c\u6211\u7b97\u4e0b\u6765\u662f=3AM
16.6\u4e2a n(n-1)/2\u4e2a
这是待定系数法的基本题目：
y=-(x-1）²+4 向下 直线x=1 （1,4） y=2(x-2)²-4
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绛旓細16...瑙ｉ杩囩▼ 浣淔G骞宠ED浜B浜嶨鐐癸紝閭ｄ箞瀹规槗鐭ラ亾鍥涜竟褰GED鏄暱鏂瑰舰锛屼簬鏄疐G=ED 鍦ㄧ洿瑙掍笁瑙掑舰FGA涓紝瑙扚AG=30搴︼紝閭ｄ箞FG=浜屽垎涔嬩竴AF=2cm.16..浣滆緟鍔╃嚎锛屽欢闀緿C锛屽苟涓斿欢闀緼B锛屼簩鑰呯浉浜や簬E锛岀瓟妗堝氨寰堟槑鏄句簡锛屽厛绠楀嚭涓夎褰CE鍚勪釜杈归暱锛屽啀鍦ㄥぇ涓夎褰DE涓绠 .....
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绛旓細姝ｆ柟褰㈤潰绉4脳4=16 闃村奖闈㈢Н16-4蟺 16棰 鍋氫竴鏉¤緟鍔╃嚎 鍙栦笁瑙掑舰OAB鍨傜洿骞冲垎绾夸笌杈筄A浜や簬P鐐 鍥涜竟褰COP鏄竴涓鏂瑰舰 涓夎褰OB闈㈢Н=涓夎褰OP闈㈢Н=½涓夎褰AB闈㈢Н 浠ユ绫绘帹鍚庝竴涓笁瑙掑舰闈㈢Н鏄墠涓涓笁瑙掑舰闈㈢Н鐨勪簩鍒嗕箣涓 涓夎褰FG闈㈢Н=涓夎褰AB闈㈢Н梅32=½...
绛旓細13.x=5,x+5=10 10*10=100 100-3=97 14.瑙ｆ硶1锛歛2-2a+1=0 鍒欙紙a-1)2=0, a=1 灏 a=1浠ｅ叆锛2a2-4a+5=3 瑙ｆ硶浜岋細2a2-4a+5 =2(a2-2a+1)+3 =2*0+3 =3 15.鐢变簬2涓椤瑰紡涔嬪拰涓嶅惈浜屾椤瑰紡锛屽嵆 -8+2m=0 m=4 16.鐢卞浘鍙煡a<0, b>0 =-2b ...
绛旓細0.22=A+1.3(B-A)0.16=A+0.9(B-A)鐩稿噺 0.22-0.16=(1.3-0.9)(B-A)B-A=0.06/0.4=0.15 浠ｅ叆0.22=A+1.3(B-A)0.22=A+1.3*0.15 A=0.22-1.3*0.15=0.025 浠ｅ叆B-A=0.15 鎵浠 A=0.025 B=0.15+0.025=0.175 ...
绛旓細15
