急求人教版七年级下数学141页第7题答案
\u4eba\u6559\u7248\u4e03\u5e74\u7ea7\u4e0b\u6570\u5b66\u5bfc\u822a\u7b54\u6848\u597d\u597d\u5b66\u4e60 \u5929\u5929\u5411\u4e0a \u5427
1.\uff081\uff09x<2\u3002\uff082\uff09x\uff1e4\u3002\uff083\uff092\uff1cx\uff1c4\u3002\uff084\uff09\u65e0\u89e3\u3002
2\uff081\uff091/2\uff1cx\uff1c2\u3002\uff082\uff09\u65e0\u89e3\u3002\uff083\uff09X\uff1c-(1/4)
\u3000\uff084\uff09X\u22641\u3002\uff085\uff09X\uff1c\uff0d7\u3002\uff086\uff09\u65e0\u89e3
3\u3002\u89c1\u8bfe\u672c137-140\u9875\uff0c\u81ea\u5df1\u603b\u7ed3\uff0c\u5408\u7406\u5373\u53ef\u3002
4. \u8bbe\u8fdb\u4ef7x \uff0c125\u2264X\uff1c137 \uff08\u5355\u4f4d\uff1a\u5143\uff09
5.\u8bbe\u591a\u62bdx 0.4\u2264 x\u22640.55 \uff08\u5355\u4f4d\uff1a\u5428\uff09
6.\u8bbe\u5242\u91cf\u8303\u56f4\u4e3ax 15 \u2264 x\u226440 \uff08\u5355\u4f4d\uff1a\u6beb\u514b)
7.\u89e3\u7b2c\u4e00\u4e2a\u5f97\uff1ax\uff1e2 \uff0c\u89e3\u7b2c\u4e8c\u4e2a\u5f97\uff1ax\uff1e2\uff0c\u89e3\u7b2c\u4e09\u4e2a\u5f97\uff1ax\uff1e2\uff0c\u6240\u4ee5\uff0c\u4e09\u4e2a\u4e0d\u7b49\u5f0f\u89e3\u96c6\u7684\u516c\u5171\u90e8\u5206\u662f\uff1ax\uff1e2 \u3002
8.\u7531\u9898\u5f97\u4e0d\u7b49\u5f0f\u7ec4\uff1a3X-7\u22652\u548c3X-7<8\uff0c\u89e3\u5f97\uff1a3\u2264x\uff1c5\uff0c\u53c8x\u4e3a\u6574\u6570\uff0c\u6240\u4ee5x\u7684\u503c\u4e3a3\u62164.\u3002
9.\u5b66\u751f\u67096\u4eba\uff0c\u4e66\u670926\u672c
绛旓細锛4锛夊姞鏉冨钩鍧囨暟=6锛孲²₄=1/7[3脳锛3-6锛²+锛6-6锛²+3脳锛9-6锛²]=1/7脳(27+27)=54/7.鏈夐鍙煡锛氾紙1锛変笉娉㈠姩锛岋紙2锛夋涔嬶紝鍏舵涓猴紝锛3锛夋尝鍔ㄦ渶澶с2.瑙ｏ細鍔犳潈骞冲潎鏁扮敳=5.85+5.93+6.07+5.91+5.99+6.13+5.98+6.05+6.00+6.19/10...
绛旓細锛1锛2x-1锛0 鈶 x+1锛3 鈶 瑙ｏ細瑙ｄ笉绛夊紡鈶狅紝寰楋細x锛1/2 瑙ｄ笉绛夊紡鈶★紝寰楋細x锛2 鎵浠ヨ繖涓柟绋嬬粍鐨勮В鏄細1/2锛渪锛2 锛2锛-3x-1锛3 鈶 2x+1锛3 鈶 瑙ｏ細瑙ｄ笉绛夊紡鈶狅紝寰楋細x锛-4/3 瑙ｄ笉绛夊紡鈶★紝寰楋細x锛1 鎵浠ヨ繖涓柟绋嬬粍鏃犺В銆傦紙3锛3锛坸-1锛+13锛5x-2(5-x)...
绛旓細锛4锛塜鈮1銆傦紙5锛塜锛滐紞7銆傦紙6锛夋棤瑙 3銆傝璇炬湰137-140椤碉紝鑷繁鎬荤粨锛屽悎鐞嗗嵆鍙4. 璁捐繘浠穢 锛125鈮锛137 锛堝崟浣嶏細鍏冿級5.璁惧鎶絰 0.4鈮 x鈮0.55 锛堝崟浣嶏細鍚級6.璁惧墏閲忚寖鍥翠负x 15 鈮 x鈮40 锛堝崟浣嶏細姣厠<mg>)7.瑙ｇ涓涓緱锛歺锛2 锛岃В绗簩涓緱锛歺锛2锛岃В绗笁涓...
绛旓細1.锛1锛墄<2銆傦紙2锛墄锛4銆傦紙3锛2锛渪锛4銆傦紙4锛夋棤瑙ｃ2锛1锛1/2锛渪锛2銆傦紙2锛夋棤瑙ｃ傦紙3锛塜锛-(1/4)锛4锛塜鈮1銆傦紙5锛塜锛滐紞7銆傦紙6锛夋棤瑙 3銆傝璇炬湰137-140椤碉紝鑷繁鎬荤粨锛屽悎鐞嗗嵆鍙4. 璁捐繘浠穢 锛125鈮锛137 锛堝崟浣嶏細鍏冿級5.璁惧鎶絰 0.4鈮 x鈮0.55 锛堝崟浣嶏細鍚級...
绛旓細涓冨勾绾т笅鍐屼汉鏁欑増鏁板璇炬湰涔犻141椤绛旀 1.鍥涚粍鏁扮殑骞冲潎鏁伴兘鏄6锛屾柟宸槸0锛4/7,44/7,54/7銆傛柟宸秺澶э紝鏁版嵁娉㈠姩瓒婂ぇ锛屾柟宸秺灏忥紝鏁版嵁娉㈠姩瓒婂皬銆2.閫氳繃璁＄畻鐢蹭箼鎴愮哗鐨勬柟宸紝鍙緱杩愬姩鍛樼敳鐨勬垚缁╂洿绋冲畾銆 娌℃湁棰 鍦ㄧ洿绾夸笁瑙掑舰涓紝鏈変竴涓攼瑙掓槸鍙︿竴涓攼瑙掔殑涓ゅ嶏紝姹傝繖涓攼瑙掔殑搴︽暟銆 1.锛1锛墄<...
绛旓細鎵嬫満鐗 鎴戠殑鐭ラ亾 鎬ユ眰浜烘暀鐗堜竷骞寸骇涓嬫暟瀛141椤绗7棰樼瓟妗 宸茬畻鍑,缁撴灉璁╀汉闅句互缃俊鎴戠畻鍑虹殑缁撴灉涓236823鍙13鍒1... 宸茬畻鍑,缁撴灉璁╀汉闅句互缃俊鎴戠畻鍑虹殑缁撴灉涓236823鍙13鍒1 灞曞紑 鎴戞潵绛 鍒嗕韩 寰俊鎵竴鎵 缃戠粶绻佸繖璇风◢鍚庨噸璇 鏂版氮寰崥 QQ绌洪棿 涓炬姤 娴忚1577 娆 鍙変腑1涓垨澶氫釜涓嬮潰鐨勫叧閿瘝,鎼滅储...
绛旓細4x 鈮 60 瑙ｈ繖涓笉绛夊紡缁勶紝鐨15 鈮 x 鈮 40. 绛旓細姣忔鏈嶇敤杩欑鍜殑鍓傞噺鍦15mg鍒40mg涔嬮棿銆7锛氳В锛氳В涓嶇瓑寮5x-1锛3锛坸+1锛夛紝寰梮锛2锛岃В涓嶇瓑寮1/2x-1锛3-3/2x,寰梮锛2. 瑙ｄ笉绛夊紡x-1锛3x+1锛屽緱x锛-1锛屾墍浠ヨ繖涓変釜涓嶇瓑寮忚В闆嗙殑鍏叡閮ㄥ垎涓簒锛2 鎵撹繖浜涘绱簡 LZ澶氬姞鐐瑰垎鏄倊...
绛旓細(1){2x-1>0锛1锛墄+1<3锛2锛夎В 涓嶇瓑寮1锛屽緱x锛-涓夊垎涔嬪洓锛岃В涓嶇瓑寮2锛屽緱 x锛1锛屾墍浠ヤ笉绛夊紡缁勬棤瑙
绛旓細鍒3娆℃湇鐢紝鏈夋柟绋嬬粍锛3x鈮60 3x鈮120 瑙ｏ紝寰 20鈮鈮40 鍒4娆℃湇鐢紝鏈夋柟绋嬬粍锛4x鈮60 4x鈮120 瑙ｏ紝寰 15鈮鈮30 7锛墄锛2 8锛墄锛3鎴杧=4 9锛夎鏈墄鍚嶅鐢燂紝鍒欐湁锛3x+8锛夋湰涔 鍒楁柟绋 3x+8鈮5锛坸-1锛3x+8锛5锛坸-1锛+3 瑙ｏ紝寰 x=6,3x+8=26 ...
绛旓細璁捐繘浠蜂负x, 110%x=150 x=136 120%x=150 x=125 绛旓細杩涜揣鑼冨洿涓125~136鍏冦
