初一数学题，用一元一次方程解题，各位学霸帮帮忙啊…
\u5b66\u9738\u4eec\u5e2e\u5e2e\u5fd9\uff0c\u521d\u4e00\u6570\u5b66\uff0c\u7528\u4e00\u5143\u4e00\u6b21\u65b9\u7a0b\u89e3\u7b54\uff08\u4e0a\u9762\u768435\u9898\uff09\u89e3\uff1a\uff081\uff09\u8bbe\u751f\u4ea7X\u4ef6\u4ea7\u54c1\uff0c\u5219X/16=X/24+20\uff0c\u89e3\u5f97X=960.
\uff082\uff09\u7532\u5355\u72ec\uff1a\u970060\u5929\uff0c\u5171\u9700\u8d39\u7528\u4e3a\uff1a60\u00d780+60\u00d75=5100\u5143
\u4e59\u5355\u72ec\uff1a\u970040\u5929\uff0c\u5171\u9700\u8d39\u7528\u4e3a\uff1a40\u00d7120+40\u00d75=5000\u5143
\u7532\u4e59\u5408\u4f5c\uff1a\u5219\u6bcf\u5929\u751f\u4ea716+24=40\u4ef6\uff0c\u970024\u5929\uff0c\u5171\u9700\u8d39\u7528\u4e3a\uff1a24\u00d780+24\u00d7120+24\u00d75=4920\u5143
\u6240\u4ee5\u7532\u4e59\u5408\u4f5c\u65e2\u7701\u94b1\u53c8\u7701\u65f6\u3002
(5+X)x80=180X
400+80X=180x
400=100x
x=4
1000-4x180=1000-720=280（米）
2.设成本价为X元
（1+40%）x-80%（1+40%)=400
20%x=400
x=400\20%
x=2000
3.设规定期限为x天
20x+120=24(x-6)
20x+120=24x-144
4x=264
x=66
（66-6）x24=60x24=1440(套）
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绛旓細鎴栬呰椹撮┊璐х墿琚嬫暟涓簒,楠″瓙椹揣鐗╄鏁颁负y锛屽垯y+1=2(x-1) 鍜 y-1=x+1 瑙ｅ嚭x=5 y=7 3銆佷袱娆¤喘鐗╁晢鍝佷负鎵撴姌鍓嶄环鏍煎垎鍒负80鍏冦305鍏冿紝鍚堣385鍏冿紝濡涓娆鎬т粯娆惧垯搴斾粯385x0.8=308鍏
绛旓細25x+y=1200 绛旀锛歺=48 y=47 (2) 18x+23y=2303 74x-y=1998 绛旀锛歺=27 y=79 (3) 44x+90y=7796 44x+y=3476 绛旀锛歺=79 y=48 (4) 76x-66y=4082 30x-y=2940 绛旀锛歺=98 y=51 (5) 67x+54y=8546 71x-y=5680 绛旀锛歺=80 y=59 (6) 42x-95y=-1410 21x-y=1575 ...
绛旓細姹鍒濅竴鏁板涓鍏冧竴娆℃柟绋嬮,澶氬鐩婂杽 1.宸茬煡4x2n-5+5=0鏄叧浜巟鐨涓鍏冧竴娆℃柟绋,鍒檔=___. 2.鑻=-1鏄柟绋2x-3a=7鐨勮В,鍒檃=___. 3.褰搙=___鏃,浠ｆ暟寮 x-1鍜 鐨勫间簰涓虹浉鍙嶆暟. 4.宸茬煡x鐨 涓巟鐨3鍊嶇殑鍜屾瘮x鐨2鍊嶅皯6,鍒楀嚭鏂圭▼涓篲__. 5.鍦ㄦ柟绋4x+3y=1涓,鐢▁鐨勪唬鏁板紡琛ㄧずy,鍒檡=___....
绛旓細1.瑙ｏ細璁句粖骞村効瀛恱宀侊紝鐖朵翰3x宀 3x-5=4(x-5)3x-5=4x-20 4x-3x=20-5 x=15 3x=3*15=45 绛旓細浠婂勾鐖朵翰45宀侊紝鍎垮瓙15宀 2.1锛夎В锛氳涔樺鎬讳汉鏁颁负x浜 x(1-4/7-1/3)=42 x*2/21=42 x=42*21/2 x=441浜 2锛夌敺鎬ф瘮濂虫у锛441*锛4/7-1/3锛=441*5/21=105浜 3.瑙ｏ細璁...
绛旓細绛旀锛歺=48 y=47 (2) 18x+23y=2303 74x-y=1998 绛旀锛歺=27 y=79 (3) 44x+90y=7796 44x+y=3476 绛旀锛歺=79 y=48 (4) 76x-66y=4082 30x-y=2940 绛旀锛歺=98 y=51 (5) 67x+54y=8546 71x-y=5680 绛旀锛歺=80 y=59 (6) 42x-95y=-1410 21x-y=1575 绛旀锛歺=75 y...
绛旓細瑙ｈ锛氳繍鍔ㄩ瀷鐨勬爣浠锋槸x鍏冿紝鏍规嵁棰樻剰寰楋細锛90%x-250锛壝250锛15.2 涔熷彲浠ョ敱鍞环-杩涗环=鍒╂鼎杩欎竴绛夐噺鍏崇郴鍒鏂圭▼锛90%x-250=250x15.2 瑙ｈ繖涓柟绋嬪緱锛歺=320 绛旓細杩愬姩闉嬬殑鏍囦环鏄320鍏冦傦紙2锛夋煇鍟嗗搧鐨勫師鍞环鏄50鍏冿紝鍥犻攢鍞笉鐣呮墦涔濇姌閿鍞紝鍚庡張鍥犲晢鍝佺揣閿鎻愪环鑻ュ共锛屾瘡浠跺敭浠蜂负54鍏冿紝闂彁浠风殑...
绛旓細(X+X*3/2)*32=400 X=5锛孹*3/2=7.5 灏忔槑閫熷害涓5绫/绉掞紝鍙斿彅閫熷害涓7.5绫/绉.锛2锛400/锛7.5-5锛=160 闅160绉掔浉閬 2銆(1)璁惧鏍″埌椋庢櫙鍖虹殑璺濈涓篨,X/24=X/60+0.5,绛夊紡涓よ竟閮戒箻浠240锛10X=4X+120,X=20 瀛︽牎鍒伴鏅尯鐨勮窛绂讳负20鍗冪背 (2)璁炬琛屼笂灞辩殑璺濈涓篨,涔樺潗缂嗚溅鐨...
绛旓細1.瑙ｏ細璁剧粡杩噚灏忔椂涓や汉鐩搁亣 绛夐噺鍏崇郴锛氱浉閬囨椂涓や汉鐨勮矾绋嬪拰=AB璺濈锛100鍗冪背锛20x+60x=100 80x=100 x=100梅80 x=1.25 绛旓細1.25灏忔椂鍚庝袱浜虹浉閬 2.瑙ｏ細璁炬垚鏈瑇鍏 绛夐噺鍏崇郴锛氬敭浠=鎴愭湰+15 x(1+40%)*80%=x+15 x*1.4*0.8=x+15 1.12x=x+15 1.12x-x=15 0.12x=15 x=15梅0...
