这道题咋做，急求，数学高手来，学霸快来呀，急求，回答好给好评！ 数学咋学
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AB=AC
BC=2BD
∴2AB+2BD=34
∴AB+BD=17
∵AB+AD+BD=30
∴AD=30-17=13cm
绛旓細瑙ｏ細鈭礎B+AC+BC=34 AB=AC BC=2BD 鈭2AB+2BD=34 鈭碅B+BD=17 鈭礎B+AD+BD=30 鈭碅D=30-17=13cm
绛旓細1锛変互闀垮拰瀹斤細4脳5 鐨勭煩褰笂鍋氫竴涓渶澶х殑鍐呭垏鍦嗭紝鍗婂緞涓2锛涘悜涓嬪仛涓涓渾鏌憋紱鍏朵綋绉疺1=2^2 脳 蟺脳6锛24蟺 锛堢珛鏂瑰垎绫筹級锛2锛変互瀹藉拰楂橈細5脳6鐨勭煩褰笂鍋氫竴涓渶澶х殑鍐呭垏鍦嗭紝鍗婂緞涓2.5锛涙í鍚戝仛涓涓渾鏌憋紱鍏朵綋绉疺1=2.5^2 脳 蟺脳4锛25蟺 锛堢珛鏂瑰垎绫筹級锛3锛変互闀垮拰楂橈細4脳6鐨勭煩褰...
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绛旓細绗竴涓槸6銆13銆20 绗簩涓1536 鐢棰樼洰鍙煡鍥涗釜鐩搁偦鐨勬暟涔嬪拰鏄礋鏁帮紝閭ｄ箞鍥涗釜鐩搁偦鐨勬暟瀛楃殑娆℃柟鍒嗗埆鏄伓鏁板鏁板伓鏁板鏁板苟涓640绛変簬涓や釜濂囨暟娆″箓鐨勫拰鍗2鐨刋娆℃柟鍔犱笂2鐨剎+2娆℃柟绛変簬640锛屽緱鍒癤=7,鏈鍚庡緱鍒2鐨9娆℃柟鍑忓幓2鐨-10娆℃柟绛変簬1536
绛旓細锛1锛12脳12脳12=1728锛堝钩鏂瑰帢绫筹級 1728梅18梅10=9.6锛堝帢绫筹級锛2锛5脳5脳5=125锛坢³锛500ml=0.5鍗 125梅0.5=250锛堟澂锛夛紙3锛6脳16=96锛堝钩鏂瑰垎绫筹級 96骞虫柟鍒嗙背=96鍗 96脳0.74=71.04(鍗冨厠锛変繚璇佸锛
绛旓細120/(24+x)=(120/2+20)/(24-x)瑙ｅ緱x=4.8鍗冪背/灏忔椂
绛旓細200(X-5)+180X=5460 X=17 17,0,360搴︽兂锛1-62.5%锛=135搴,0,璇峰摢浣嶆噦鏁板鐨楂樻墜甯繖鐪嬩笅杩欓璇鎬庝箞鍋,璋㈣阿浜!涓鍧楀渾褰㈤搧鐨,鍓幓涓涓墖褰互鍚,鍓╀笅閮ㄥ垎鐨勯潰绉槸鍘熼搧鐨潰绉殑62.5%,鍒欏壀鍘荤殑閭ｄ釜鎵囧舰鐨勫渾蹇冭鐨勫害鏁版槸鍑犲害?瑕佸叿浣撹繃绋嬶紒锛堣繖鏄垜灏忓効鑰冨嵎涓婄殑涓閬撻敊棰橈級鎷滄墭浜嗭紒锛
绛旓細鏁板棰,楂樻墜蹇潵鎬!~ 璁炬昏矾绋嬩负x鍗冪背;閭ｄ箞绗竴娆＄浉閬囨椂鐢茶浜嗗叏绋嬬殑3/(3+5)=3/8,鍗(3/8)x鍗冪背 鍒嗘瀽:浜屼汉鍏辫浜嗕笁娈礎B璺濈(閫氳繃绠鍗曠敾鍥惧彲鐭),鍏朵腑鐢茶浜2娈礎B璺濈缂(3/8)x+24鍗冪背,鑰屼箼琛屼簡涓娈礎B璺濈鍔(3/8)x+24鍗冪背; 鍥犱负浜屼汉閮芥病鍋,鎵浠ヨ鐨勬昏矾绋嬫瘮灏辨槸閫熷害姣,寰楁瘮渚: {2x-[(3/8...
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绛旓細鍚屾潗鏂欐墍浠ユ瘮鐑閮芥槸c銆傝鐢查檷浣庢俯搴︿负t1锛屼箼涓簍2.鍒欙紙c*m1*t1锛/锛坈*m2*t2锛=N:M.t1/t2=N²:M²
