七年级下册数学的方程题 七年级下册数学期中考试试卷。
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A\uff0e3x-y2=0 B\uff0e + =1 C\uff0e - y=6 D\uff0e4xy=3
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A\uff0ey= B\uff0ey= C\uff0ex= D\uff0ex=
3\uff0e\u65b9\u7a0b\u7ec4 \u7684\u89e3\u662f\uff08 \uff09
A\uff0e B\uff0e C\uff0e D\uff0e
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A\uff0e31 B\uff0e- C\uff0e D\uff0e\u4e0d\u80fd\u786e\u5b9a
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A\uff0e2 B\uff0e C\uff0e1 D\uff0e-1
6\uff0e\u4e0b\u5217\u5404\u7ec4\u6570\u4e2d\uff0c\u65e2\u662f\u65b9\u7a0b2x-y=3\u7684\u89e3\uff0c\u53c8\u662f\u65b9\u7a0b3x+4y=10\u7684\u89e3\u662f\uff08 \uff09
A\uff0e B\uff0e C\uff0e D\uff0e
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A\uff0ea=2\uff0cb=-1 B\uff0ea=2\uff0cb=1 C\uff0ea=-2\uff0cb=1 D\uff0ea=-2\uff0cb=-1
8\uff0e\u65b9\u7a0b3x+2y=5\u7684\u975e\u8d1f\u6574\u6570\u89e3\u7684\u4e2a\u6570\u4e3a\uff08 \uff09
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A\uff0e B\uff0e- C\uff0e D\uff0e-
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A\uff0ex=3\uff0cy=2 B\uff0ex=2\uff0cy=3 C\uff0ex=0\uff0cy=5 D\uff0ex=5\uff0cy=0
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15\uff0e\u5df2\u77e5m-3n=2m+n-15=1\uff0c\u5219m=________\uff0cn=________\uff0e
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3000
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18\uff0e\u65b9\u7a0b\u7ec4 \u7684\u89e3\u662f________\uff0e
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12\uff0eB 13\uff0e2\uff1b0 14\uff0e3\uff1b-1
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\u2460-\u2461 \u5f972y=2\uff0c\u2234y=1\uff0e
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19\uff0e \u5343\u7c73/\u65f6 20\uff0e5\u4e2a
21\uff0e\uff081\uff09 \uff082\uff09 \uff083\uff09 \uff084\uff09
22\uff0e\u89e3\uff1a\u89e3\u65b9\u7a0b\u7ec4
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f0c\u8d2d\u7269\u6ee1100\u5143\u8005\u53d1\u5bf9\u5956\u5238\u4e00\u5f20\u3002\u572810000\u5f20\u5956\u5238\u4e2d\uff0c\u8bbe\u7279\u7b49\u59561\u4e2a\uff0c\u4e00\u7b49\u595610\u4e2a\uff0c\u4e8c\u7b49\u5956100\u4e2a\u3002\u82e5\u67d0\u4eba\u8d2d\u7269\u521a\u597d\u6ee1100\u5143\uff0c\u5206\u522b\u6c42\u6b64\u4eba\u4e2d\u7279\u7b49\u5956\uff0c\u4e00\u7b49\u5956\uff0c\u4e8c\u7b49\u5956\u4ee5\u53ca\u4e2d\u5956\u7684\u6982\u7387\u5404\u662f\u591a\u5c11\u3002\x0d\x0a\x0d\x0a17.\uff085\u5206\uff09\x0d\x0a\x0d\x0a18.\uff086\u5206\uff09\u5df2\u77e5x=,y=-1,\u6c42\u7684\u503c\x0d\x0a\x0d\x0a19.\uff086\u5206\uff09\u4e0b\u5217\u4e8b\u4ef6\u4e2d\uff0c\u54ea\u4e9b\u662f\u4e0d\u786e\u5b9a\u4e8b\u4ef6\uff0c\u54ea\u4e9b\u662f\u5fc5\u7136\u4e8b\u4ef6\uff0c\u54ea\u4e9b\u662f\u4e0d\u53ef\u80fd\u4e8b\u4ef6\uff1f\x0d\x0a\uff081\uff09\u5728\u6807\u51c6\u5927\u6c14\u538b\u4e0b\uff0c\u6e29\u5ea6\u8fbe\u5230100C\u65f6\u6c34\u4f1a\u6cb8\u817e\uff1b\uff082\uff09\u6ca1\u6709\u6c34\u5206\uff0c\u79cd\u5b50\u53d1\u82bd\uff1b\uff083\uff09\u4ece\u4e00\u4e2a\u73ed\u7ea7\u4e2d\u4efb\u610f\u62bd\u53d65\u4eba\uff0c\u7ed3\u679c\u8fd95\u4eba\u90fd\u662f\u7537\u751f\uff1b\uff084\uff09\u660e\u5929\u672c\u5e02\u6709\u96e8\uff1b\uff085\uff09\u6253\u5f00\u7535\u89c6\u673a\uff0c\u6b63\u5728\u64ad\u65b0\u95fb\u8054\u64ad\uff1b\uff086\uff09\u4e00\u4e2a\u6b63\u6570\u7684\u76f8\u53cd\u6570\u662f\u5b83\u672c\u8eab\x0d\x0a\u7b54\uff1a\u4e0d\u786e\u5b9a\u4e8b\u4ef6\u6709\uff1a\u5fc5\u7136\u4e8b\u4ef6\u6709\uff1a\x0d\x0a\x0d\x0a\u4e0d\u53ef\u80fd\u4e8b\u4ef6\u6709\uff1a\x0d\x0a\x0d\x0a20.\u5982\u56fe\uff0ca\u2016b,b\u2016c,\u5199\u51fa\u56fe\u4e2d\u5404\u4e2a\u89d2\u4e4b\u95f4\u7684\u7b49\u91cf\u5173\u7cfb\u3002\uff08\u53ea\u5199\u7ed3\u8bba\uff0c\u5199\u5bf9\u4e00\u4e2a\u5f97\u4e00\u5206\uff0c\u6700\u591a\u5f978\u5206\uff09\x0d\x0a\x0d\x0a21.\uff088\u5206\uff09\u5982\u56fe\uff0c\u2220l\uff1d\u22202\uff0cDE\u22a5BC\uff0cAB\u22a5BC\uff0c\u90a3\u4e48\u2220A=\u22203\u5417\uff1f\u8bf4\u660e\u7406\u7531.\uff08\u8bf7\u4e3a\u6bcf\u4e00\u6b65\u63a8\u7406\u6ce8\u660e\u4f9d\u636e\uff09\x0d\x0a\u7ed3\u8bba\uff1a\u2220A\u4e0e\u22203\u76f8\u7b49\uff0c\u7406\u7531\u5982\u4e0b\uff1a\x0d\x0a\x0d\x0a\u2235DE\u22a5BC\uff0cAB\u22a5BC\uff08\u5df2\u77e5\uff09\x0d\x0a\u2234\u2220DEC=\u2220ABC=90\u00b0\uff08\uff09\x0d\x0a\x0d\x0a\u2234DE\u2016BC()\x0d\x0a\x0d\x0a\u2234\u22201=\u2220A\uff08\uff09\x0d\x0a\u7531DE\u2016BC\u8fd8\u53ef\u5f97\u5230\uff1a\x0d\x0a\u22202=\u22203\uff08\uff09\x0d\x0a\u53c8\u2235\u2220l\uff1d\u22202\uff08\u5df2\u77e5\uff09\x0d\x0a\u2234\u2220A=\u22203\uff08\u7b49\u91cf\u4ee3\u6362\uff09\x0d\x0a\x0d\x0a22.\uff088\u5206\uff09\u4e00\u53ea\u4e0d\u900f\u660e\u7684\u888b\u5b50\u4e2d\uff0c\u88c5\u67092\u4e2a\u767d\u7403\u548c1\u4e2a\u7ea2\u7403\uff0c\u8fd9\u4e9b\u7403\u9664\u989c\u8272\u5916\u8005\u90fd\u76f8\u540c\u3002\x0d\x0a\uff081\uff09\u5c0f\u660e\u8ba4\u4e3a\uff0c\u6405\u5747\u540e\u4ece\u4e2d\u4efb\u610f\u6478\u51fa\u4e00\u4e2a\u7403\uff0c\u4e0d\u662f\u767d\u7403\u5c31\u662f\u7ea2\u7403\uff0c\u56e0\u6b64\u6a21\u51fa\u767d\u7403\u548c\u6a21\u51fa\u7ea2\u7403\u662f\u7b49\u53ef\u80fd\u7684\u3002\u4f60\u540c\u610f\u4ed6\u7684\u8bf4\u6cd5\u5417\uff1f\u4e3a\u4ec0\u4e48\uff1f\x0d\x0a\uff082\uff09\u6405\u5747\u540e\u4ece\u4e2d\u6478\u51fa\u4e00\u4e2a\u7403\uff0c\u8bf7\u6c42\u51fa\u4e0d\u662f\u767d\u7403\u7684\u6982\u7387\uff1b\x0d\x0a\uff083\uff09\u6405\u5747\u540e\u4ece\u4e2d\u4efb\u610f\u6478\u51fa\u4e00\u4e2a\u7403\uff0c\u8981\u4f7f\u6478\u51fa\u7ea2\u7403\u7684\u6982\u7387\u4e3a\uff0c\u5e94\u5982\u4f55\u6dfb\u52a0\u7ea2\u7403\uff1f
﹙1﹚
x＋y=7﹙1﹚
x－2y=－2﹙2﹚
解：﹙1﹚×2得
2x＋2y=14﹙3﹚
﹙3﹚＋﹙2﹚得
3x=12
x=4
把x=4代入﹙1﹚得
4＋y=7
y=3
∴方程的解为：
x=4
y=3
﹙3﹚
2x－1＞x＋1﹙1﹚
x＋6＜4x－3﹙2﹚
解：由﹙1﹚得x＞2
由﹙2﹚得x＞3
∴x＞3
对不起啊，第二题看不清楚，第三题的图我画了个大概。
第一题：x=4
y=3
第二题：题目不清
第三题：x>2
x>3
所以x>3
移项的X>2
9>3X
所以2<x<3
亲，你倒是拍清楚些啊，看不清啊
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绛旓細锛1锛変袱涓鏂圭▼缁勭殑瑙ｇ浉鍚岋紝鎵浠=3锛寉=4銆傛墍浠ユ鏃堕渶瑕佽В锛3m+4n=5鍜3n+4m=2涓や釜鏂圭▼缁勭殑瑙ｃ12m+16n=20 12m+9n=6 瑙ｅ緱锛歮= -1锛沶=2銆傦紙2锛夌敱浜庝袱涓柟绋嬬粍鐨勮В鐩稿悓锛屼笖閮芥槸浜屽厓涓娆℃柟绋嬬粍锛屽洜姝ゅ彧闇瑕佷袱涓笉甯︽湭鐭ュ弬鏁板氨鍙互瑙ｅ緱鍏惰Вx锛寉銆傛柟绋嬬粍濡備笅銆2x- 3y=15 x+y=1 鐢辨...
绛旓細(1)3x-2y==19 (2)瑙ｏ紝寰楋細鐢憋紙1锛*2+锛2锛*3寰 4x+6y+9x-6y==-18+57 13x==39 x==3 鎶妜甯﹀叆锛2锛夊緱锛9-2y==19 y==5 锛2锛1-2(x-1)<=5 锛1锛(3x-2)/2<x+1/2 锛2锛夎В锛屽緱锛氱敱锛1锛夊緱锛
绛旓細瑙ｇ瓟锛1銆42鍒嗛挓锛0.7灏忔椂 鈭垫苯杞︽晠闅滅偣璺濇満鍦15Km锛屾瘡娆″彧鑳介5浜猴紝姹借溅骞冲潎閫熷害60Km/h 鈭(1)灏忔苯杞﹂佽蛋绗竴鎵逛汉鍚庯紝绗簩鎵逛汉鍦ㄥ師鍦扮瓑寰呮苯杞﹁繑鍥炴帴閫侊紱鍒欏皬姹借溅閫佺涓鎵逛汉鍒版満鍦烘墍鐢ㄦ椂闂达紳15梅60锛0.25 灏忔椂锛涒埓灏忔苯杞﹁繑鍥炴帴绗簩鎵逛汉鍐嶅埌鏈哄満鎵鐢ㄦ椂闂达紳15脳2梅60锛0.5 灏忔椂锛涒埓鍏辩敤鏃堕棿锛0...
绛旓細瑙ｇ瓟涓嬪垪闂锛氣憼褰搙鍙栦綍鍊兼椂锛寉1=y2?3x+2=4-x锛4x=2;x=2鍒嗕箣1 鈶″綋x鍙栦綍鍊兼椂锛寉1姣攜2澶4锛3x+2-锛4-x锛=4锛泋=2鍒嗕箣3銆傝绠楄繖绫棰樼洰鏃讹紝鍏堟妸鏈煡鏁扮Щ鍒板乏杈癸紝鎶婂凡鐭ユ暟绉诲埌鍙宠竟锛屽啀杩涜鍚堝苟璁＄畻锛岀Щ椤规椂娉ㄦ剰绗﹀彿瑕佺浉鍙嶃傚鍒嗘暟鐨勶紝瑕佸厛鍘诲垎姣嶏紝鍐嶈繘琛岃绠椼傝繖鏍疯В閲婃槸鍚﹁兘鎳傦紵
绛旓細锛5锛夎В锛氬幓鎷彿锛1/5X-3/2+X=1 绉婚」锛1/5X+X=1+3/2 鍚堝苟鍚岀被椤癸細6/5X=5/2 鍖栫郴鏁颁负1锛歑=25/12 锛6锛夎В锛氱Щ椤癸細4X-3X=-3 鍚堝苟鍚岀被椤癸細X=-3 锛7锛夎В锛15x-6=14x=16 x=16+6 x=22 锛8锛夎В锛氱Щ椤癸細6X-4X=5/4+3/4 鍚堝苟鍚岀被椤癸細2X=2 鍖栫郴鏁颁负1锛歑=1 锛9...
绛旓細瑙ｏ細璁炬瘡鍒嗛挓娑屽嚭x浠芥按閲 40脳2-40x=4脳16-16x 80-40x=64-16x 16=24x x=2/3 瑙ｏ細璁鹃渶瑕亂鍙版娊姘存満 10y-10脳2/3=40脳2-40脳2/3 10y-20/3=80-80/3 10y=60 y=6 鎵浠ラ渶瑕6鍙
绛旓細鐢遍鎰忓彲寰楋細锛6锛4锛墄锛100 瑙ｅ緱锛歺锛10 鎵浠ュ皬鐙楀叡璺戠殑璺▼涓猴細10脳10锛100鍗冪背 涓鍏冧竴娆鏂圭▼棰樼洰 0鍒 鍥炵瓟锛2 娴忚锛734 鎻愰棶鏃堕棿锛2007-12-16 20:06 鐢蹭箼涓や汉鍦400绫抽暱鐨勭幆琛岃窇閬撲笂璺戞,涓や汉鍚屾椂鍚屽湴璧疯窇,,骞朵笖鐢叉瘮涔欒窇鐨勫揩,濡傛灉鍚屽悜璺,浠栦滑杩3鍒20绉掔浉閬,濡傛灉鑳屽悜璺,浠栦滑杩...
