苏科版九年级下册数学习题5.5答案
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连接BI
∵I是△ABC的内心
∴∠BAI=∠CAI，∠ABI=∠CBI.弧BD=弧CD
∴∠BAD =∠DBC
∵∠BID=∠BAI+∠ABI
∠IBD=∠IBC +∠DBC
∴∠DBI=∠DIB
∴DB =DI
没有书
绛旓細BD涓嶪D鐩哥瓑 杩炴帴BI 鈭礗鏄柍ABC鐨勫唴蹇 鈭粹垹BAI=鈭燙AI锛屸垹ABI=鈭燙BI.寮D=寮D 鈭粹垹BAD =鈭燚BC 鈭碘垹BID=鈭燘AI+鈭燗BI 鈭營BD=鈭營BC +鈭燚BC 鈭粹垹DBI=鈭燚IB 鈭碊B =DI
绛旓細瑙ｏ細BI=AI*tan鈭燘AI=5.5tan26掳=5.5*0.49=2.7 (m)DG=BI+HGtan26掳.=2.7+5.5*0.49.=2.7+2.7 =5.4 (1) 姘存偿鏌盌G鐨勯暱涓5,4 (m)锛(2) AB=CD=5.5/os26掳=5.5/0.9=6.11鈮6.1 (m)璁惧皬鏄庣敱A鐐硅蛋鍒癊鐐规墍闇鏃堕棿涓簍, 鍒檛=t1+t2+t3+t4.鍏朵腑锛宼1=t3=AB/...
绛旓細1銆佸鍥撅紝宸茬煡AB銆丆D鏄渾O鐨勫鸡锛孉B鈯D锛屽瀭瓒充负鐐笶锛孉B琚獵D鍒嗘垚3cm銆14cm涓ゆ锛圓E锛淓B锛夛紝姹傜偣O鍒癈D鐨勮窛绂汇傝В锛氳璺濈涓篨锛屼粠鐐筄鍋欰B鐨勫瀭绾匡紝鍨傝冻涓篎锛屽垯OF鎶夾B鍒嗘垚鐩哥瓑鐨勪袱绔侫F=FB锛屽垯3+X=14-X.鍒橷=5.5.2銆佸凡鐭ワ細濡傚浘锛屽湪涓や釜鍚屽績鍦嗕腑锛屽ぇ鍦嗙殑寮B涓庡皬鍦嗙浉浜や簬鐐笴銆丏锛屼笖AC=...
绛旓細3.42 5.5 16
绛旓細1.涓庡渾鍙湁涓涓氦鐐广 涓庤鍦嗙洿寰勫瀭鐩达紝涓斿瀭瓒充负鍒囩偣銆2.1)鍥犱负5.5灏忎簬12/2锛屾墍浠ョ洿绾夸笌鍦嗙浉浜わ紝鎵浠ユ湁涓や釜浜ょ偣銆2)鍥犱负6绛変簬12/2锛屾墍浠ョ洿绾夸笌鍦嗙浉鍒囷紝鎵浠ユ湁涓涓氦鐐广3)鍥犱负8澶т簬12/2锛屾墍浠ョ洿绾夸笌鍦嗙浉绂伙紝鎵浠ユ病鏈変氦鐐
绛旓細瑙ｏ細璁惧渾鐝犵瑪鏈墄鏋濄傚垯閽㈢瑪鏈夛紙22-x)鏋濄5x+(22-x)涔6=120 5x+132-6x=120 -x+132=120 -x=-12 x=12 22-12=10(鏋濓級5涔0.9=4.5锛堝厓锛6涔0.8=4.8锛堝厓锛100闄や互锛4.5+4.8锛夌害绛変簬10鏋 绛旓細锛1锛夊渾鐝犵瑪12鏋濋挗绗10鏋濓紙2锛夊渾鐝犵瑪锛岄挗绗斿悇涔10鏋濄
绛旓細鏂圭▼寮忎袱杈瑰悓闄や互5锛岀劧鍚庨厤鏂广傛妸K褰撴垚甯告暟锛屽紡瀛愮殑鍙宠竟灏辨槸K锛嶄竴涓硷紝褰揔锛嶅幓涓涓肩瓑浜庡乏杈圭殑寮忓瓙鏃舵湁瑙ｃ
绛旓細鈶°y = -x骞虫柟/10 + 65x + 540 鏁寸悊鍚庡緱锛寉= - (x-325)鐨勫钩鏂/10 + 11102.5 鍒欏彲鐭ワ紝褰搙=325鏃讹紝y 鏈夋渶澶у硷紝鏈澶у间负11102.5,鈶㈠綋x =300銆鏃讹紝y=10940 褰撴湀绉熼噾鍒嗗埆涓300鍏冩瘡濂楁椂锛屾湀鏀剁泭鏄10940.褰撴湀鏀剁泭鏈澶ф椂锛寈 = 325 鏃讹紝y 鏈澶э紝姝ゆ椂鏈嚭绉熺殑璁惧鏄(325锛270)/...
绛旓細M/7.5=6/6.25 M=7.2 锛2锛夎嫢浠婂勾6鏈堝強浠ュ悗鏈堜唤锛岀帀绫充环鏍煎闀跨殑瑙勫緥涓嶅彉锛岃屾瘡鏈堢殑鐚倝浠锋牸鎸夌収5鏈堢殑鐚倝浠锋牸姣斾笂鏈堜笅闄嶇殑鐧惧垎鏁扮户缁笅闄嶏紝璇蜂綘棰勬祴7鏈堟椂鏄惁瑕侀噰鍙栭闃叉帾鏂解滅尓璐变激鍐 鐜夌背浠锋牸鎸夌収y=0.1x+0.5鐨勮寰嬪彉鍖栵紙y涓轰环鏍硷紝x涓烘湀浠斤級锛岀尓鑲変环鏍间笅闄嶇巼涓猴紙6.25-6锛/6.25=0....
绛旓細璁惧奖瀛愭婚暱涓簒绫 1.6:2.4=15锛歺 x=15*2.4梅1.6 x=45梅2 x=22.5绫 鍦ㄥ澹佷笂鐨勫奖瀛愰暱搴=22.5-17=5.5绫
