2020骞存禉姹熷叕鍕�(w霉)鍝¤娓暩(sh霉)閲忛棞(gu膩n)绯绘瘡鏃ヤ竴绶�(5鏈�29鏃�)
鐎忚
鏀惰棌
2020骞存禉姹熷叕鍕�(w霉)鍝¤娓暩(sh霉)閲忛棞(gu膩n)绯绘瘡鏃ヤ竴绶�(5鏈�29鏃�)
1. (1+1/2+1/3)×(1/2+1/3+1/4)-(1+1/2+1/3+1/4)×(1/2+1/3)=()
A. 1/2 B. 1/3 C. 1/4 D. 1/5
2. 鐢�銆佷箼銆佷笝涓夊悕鑸夐噸閬�(y霉n)鍕曞摗锛屼笁鍊嬬敳鐨勯珨閲嶇浉鐣�(d膩ng)浜庡洓鍊嬩箼鐨勯珨閲�锛屼笁鍊嬩箼鐨勯珨閲嶇浉鐣�(d膩ng)浜庝簩鍊嬩笝鐨勯珨閲嶏紝鐢茬殑楂旈噸姣斾笝杓�10鍗冨厠锛岀敳鐨勯珨閲嶇偤澶氬皯鍗冨厠?()
A. 60 B. 70 C. 80 D. 90
3. 灏忔潕闁嬩簡涓€鍊嬪灏忔檪鏈冭锛屾渻璀伴枊濮嬫檪鐪嬩簡鎵嬭〃锛屾渻璀扮祼(ji茅)鏉熸檪鍙堢湅浜嗘墜琛紝鐧�(f膩)鐝�(xi脿n)鏅傞嚌鑸囧垎閲濇伆濂戒簰鎻涗簡浣嶇疆銆傚晱閫欐鏈冭澶х磩闁嬩簡1灏忔檪澶氬皯鍒�?()
A. 51 B. 47 C. 45 D. 43
4. 涓€鍒楅暦鐐�280绫崇殑鐏粖锛岄€熷害鐐�20绫�/绉�锛岀稉(j墨ng)閬�2800绫崇殑澶ф⿱锛岀伀杌婂畬鍏ㄩ€氶亷閫欏骇澶ф⿱锛岄渶瑕佸闀锋檪闁�?()
A. 28绉� B. 2鍒�20绉�
C. 2鍒�28绉� D. 2鍒�34绉�
5. 涓€鍊嬬┖鐨勫绌嶇偤64鍗囩殑榧撳舰鍦撴《涓婃湁A銆丅鍏╁瓟锛屼竴绋捀椁炬按寰濧瀛旀祦鍏ュ悓鏅傚緸B瀛旀祦鍑�锛屽鏋滈€氶亷A瀛旂殑娴侀€熺偤3鍗�/灏忔檪锛岄偅涔堝湪B瀛旂殑娴侀€熺偤澶氬皯鍗囨檪鎵嶈兘淇濊瓑鐢�96灏忔檪鎭板ソ瑁濇豢瑭插鍣�?()
A. 43 B. 83 C. 73 D. 37
婧Θ鎻愮ず锛�榛炴搳涓嬮爜鍙煡鐪�2020骞存禉姹熷叕鍕�(w霉)鍝¤娓暩(sh霉)閲忛棞(gu膩n)绯绘瘡鏃ヤ竴绶�(5鏈�29鏃�)姣忔棩涓€绶寸瓟妗堛€傜敱浜�2020骞存禉姹熷叕鍕�(w霉)鍝¤€冭│鏅傞枔鎺ㄩ伈锛屽叿楂旂瓎瑭︽檪闁撳皻鏈⒑瀹�锛屽缓璀板悇浣嶈€冪敓浣跨敤鐠�(hu谩n)鐞冪恫(w菐ng)鏍� 鍏嶈不(f猫i)闋�(y霉)绱勭煭淇℃彁閱�鏈嶅嫏(w霉)锛岄爯(y霉)绱勬垚鍔熷彲鍦ㄧ瓎瑭︽檪闁撶⒑瀹氭檪鐛插緱鐭俊閫氱煡锛屾彁閱掑ぇ瀹跺仛濂芥矕鍒哄京(f霉)缈�(x铆)婧�(zh菙n)鍌欍€�
1. C銆愯В鏋愩€�(1+1/2+1/3)×(1/2+1/3+1/4)
=(1+1/2+1/3+1/4—1/4) ×(1/2+1/3+1/4)
=(1+1/2+1/3+1/4)×(1/2+1/3)+(1+1/2+1/3+1/4)×(1/4)—(1/4) ×(1/2+1/3+1/4)
=(1+1/2+1/3+1/4)×(1/2+1/3)+1/4
鍥犳(1+1/2+1/3)×(1/2+1/3+1/4)—(1+1/2+1/3+1/4)×(1/2+1/3)=1/4
[榛炶⿻]鍏跺閫欓亾椤屼篃鍙互浣跨敤瑙€瀵熸硶锛�(1+1/2+1/3)×(1/2+1/3+1/4)涔樼⿳鍚庢湁9鍊嬫暩(sh霉)瀛�
(1+1/2+1/3+1/4)×(1/2+1/3)涔樼⿳鍚庢湁8鍊嬫暩(sh霉)瀛�锛屽嵆(1+1/2+1/3)×(1/2+1/3+1/4)姣�(1+1/2+1/3+1/4)×(1/2+1/3)澶氫簡涓€鍊嬫暩(sh霉)瀛椼€�
閭ｄ箞澶氱殑鏁�(sh霉)瀛楁槸1/4銆�
2. C銆愯В涓€銆戣ō(sh猫)鐢蹭箼涓欎笁鍚嶈垑閲嶉亱(y霉n)鍕曞摗楂旈噸鍒嗗垾鐐簒锛寉锛寊锛屽墖
涓夊€嬬敳鐨勯珨閲嶇瓑浜庡洓鍊嬩箼鐨勯珨閲�锛岃鏄�3x=4y锛�
涓夊€嬩箼鐨勯珨閲嶇瓑浜庝簩鍊嬩笝鐨勯珨閲�锛岃鏄�3y=2z锛�
鐢茬殑楂旈噸姣斾笝杓�10鍗冨厠锛岃鏄巟+10=z锛�
瑙ｅ緱 x=80鍗冨厠銆�
銆愯В浜屻€戜笁鍊嬩箼鐨勯珨閲嶇瓑浜庝簩鍊嬩笝鐨勯珨閲嶏紝瑾槑涓欑殑楂旈噸鍙互琚�3鏁撮櫎锛屽洜鐐虹敳鐨勯珨閲嶆瘮涓欒紩10鍗冨厠锛屾墍浠ユ垜鍊戝彧闇€瑕佸緸绛旀涓皨鎵�+10涔嬪悗鍙互琚�3鏁撮櫎鐨勬暩(sh霉)瀛楀嵆鍙€傚彧鏈�80绗﹀悎姊濅欢銆�
3. A銆愯В鏋愩€戞檪閲濆拰鍒嗛嚌姝ｅソ浜掓彌浜嗕綅缃紝瑾槑鍏╅嚌涓€鍏辫綁(zhu菐n)閬�720搴�銆�
鍥犵偤鏅傞嚌姣忓垎閻樿綁(zhu菐n)閬�0.5搴�锛屽垎閲濇瘡鍒嗛悩杞�(zhu菐n)閬�6搴�锛屾墍浠�720/(6+0.5)=110.7鍒嗭紝绱勭偤1灏忔檪51鍒�銆�
4. D銆愯В鏋愩€戠伀杌婅韩闀�280绫�锛屽ぇ姗嬮暦搴︾偤2800绫筹紝鍓囩伀杌婂畬鍏ㄩ€氶亷閫欏骇澶ф⿱闇€瑕佽閫�(j矛n)2800+280=3080绫�?锛涚枛鍥佷浚钁�?0绫�/绉�锛屾墍浠ラ渶瑕佹檪闁�3080/20=154绉�=2鍒嗛悩34绉掋€�
5. C銆愯В鏋愩€戣ō(sh猫)B瀛旂殑娴侀€熺偤x鏅傛墠鑳戒繚璀夌敤96灏忔檪鎭板ソ瑁濇豢姝ゆ《銆�
寰濧瀛旀祦鍏ュ悓鏅傚緸B瀛旀祦鍑�锛屽鏋滈€氶亷A瀛旂殑閫熷害鐐�3鍗�/灏忔檪锛岃鏄庢《涓捀椁炬按鐨勮搫绌嶉€熷害鐐�(3-x)鍗�/灏忔檪銆�
64/(3-x)=96
瑙ｅ緱x=7/3銆�
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