数学问题，解答过程拍照片。 数学3题求解题过程详细，谢谢！可以的话写在纸上拍照片，谢谢！
\u6570\u5b66\u8ba1\u7b97\u9898\u89e3\u7b54\u8fc7\u7a0b\u5199\u7eb8\u62cd\u7167\u8fc7\u6765AC\u5782\u76f4\u4e8ePB
\u56e0PA\u5782\u76f4\u4e8e\u5e73\u9762a,AC\u5728\u5e73\u9762a\u4e0a
\u6240\u4ee5PA\u5782\u76f4\u4e8eAC,
\u2220BAC=90
\u6240\u4ee5\uff0cAC\u5782\u76f4\u4e8eAB
PA\u4e0eAB\u4ea4\u4e8e\u70b9A
\u5373\uff0cAC\u5782\u76f4\u4e8e\u5e73\u9762PAB
PB\u53c8\u5728\u5e73\u9762PAB\u4e0a
\u6240\u4ee5\uff0cAC\u5782\u76f4\u4e8ePB
5)
\u4fa7\u9762\u79ef\uff1d3*4*6\uff1d72
\u5168\u9762\u79ef\uff1d3*4*6+2*\u221a3/4*16=72+8\u221a3
\u4f53\u79ef\uff1d\u221a3/4*16*6\uff1d24\u221a3
绛旓細鈭碘垹COE鏄洿瑙 鈭粹垹COE=90掳 鈭碘垹COF=34掳 鈭粹垹BOF=56掳 鈭礝F骞冲垎鈭燗OE 鈭粹垹AOF=鈭燘OF=56掳 鈭粹垹AOC=鈭燗OF-鈭燙OF=56掳-34掳=22掳 鍙堚埖鈭燗OC涓庘垹BOD鏄椤惰 鈭粹垹BOD=22掳
绛旓細鍙戜簡鍥剧墖锛鏈蹇洖绛旓紝鏈涢噰绾筹紝璋㈣阿
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绛旓細杩欎釜璇︾粏鐨瑙ｇ瓟鍦ㄦ墜鏈轰笂鍐欎笉鍑烘潵锛屽彧鑳藉厛鍦ㄧ焊涓婂啓鍑烘潵锛岀劧鏄鎷嶇収鐗锛屾妸鍥惧彂缁欎綘锛岃浣犵湅鍚庤寰楃偣閲囩撼锛岃阿璋紒
绛旓細锛1锛夋姏鐗╃嚎瀵圭О杞磝=-b/2a=-3/4a=3锛岃В寰梐=-1/4锛屾墍浠ヨ鎶涚墿绾挎柟绋嬩负-x^2/4+3x/2+4銆備护y=0锛岃В寰梮1=-2锛寈2=8锛孉锛-2,0锛夛紝B锛8,0锛夛紙2锛塀鐐瑰潗鏍囷紙8,0锛夛紝C鐐瑰潗鏍囷紙0,4锛夛紝鍒橞C鎵鍦ㄧ洿绾挎柟绋嬩负y=-x/2+4锛屽垯璁綨鐨勫潗鏍囦负锛坣锛-n/2+4锛夈傛牴鎹鎰忥紝MN璺濈=3锛屽垯...
绛旓細璇︾粏瑙ｇ瓟杩囩▼鐪嬪浘
绛旓細1瑙ｏ細涓绉嶆湁C(2,10)=45绉嶅彇娉 a0=a9,a1=a8,a2=a7,a3=a6,a4=a5 1.灏嗕互5涓瓑寮忎腑锛屼袱涓暟鍚屾椂鍘诲埌鐨勬儏鍐靛垪鍑猴紝鍜屼负N1=1/2[ao+a1+a2+...+a9]=1/2f(1)=1/2*2^9=2^8=256 2.鍓╀綑鎯呭喌涓嬶紝鍙栦袱鑰呴棿杈冨皬鏁..瀵圭О鍒嗘瀽 鍙朼0锛宎9鐨勬儏鍐:浠や竴涓暟涓篴1~a8鍏8绉 鍙朼1锛宎8鐨勬儏鍐...
绛旓細瑙ｏ細瀵筬(x)=1/x*lnx姹傚锛宖'(x)=-(lnx+1)/(xlnx)^2 浠'(x)=0 寰楀嚭 x=1/e 鍦紙0,1/e)涓奻(x)鍗曡皟閫掑 鍦紙1/e,1)涓婂崟璋冮掑噺锛屾墍浠ュ湪1/e鍑哄彇寰楁瀬锛堟渶锛夊ぇ鍊笺俧(1/e)=e 鍐嶇湅鏉′欢鏄2^1/x>x^a 涓よ竟鍙栧鏁發n 寰楀埌锛歭n2^1/x>lnx^a 鍗筹細ln2*1/x>a*lnx ...
绛旓細瑙ｅ喅闂锛杩囩▼锛1銆佷竴涓钩琛屽洓杈瑰舰琚袱鏉＄洿绾垮垎鎴4涓皬骞宠鍥涜竟褰紝鍏朵腑涓変釜鐨勯潰绉垎鍒槸22cm²锛33cm²锛90cm²锛屽墿涓嬬殑闈㈢Н鏄灏戯紵鏍规嵁姣忎袱涓钩琛屽洓杈瑰舰鍚屽簳鍚岄珮鐨勬ц川銆傛牴鎹凡鐭3涓儴鍒嗙殑闈㈢Н鍙緱 S1=a1h1=22 S2=a1h2=33 S3=a2h2=90 鎵姹係4=a2h1 鏈夊墠涓や釜寮忓瓙鍙緱h1:...
