2020骞存睙瑗垮叕鍕�(w霉)鍝¤€冭│琛屾脯鏁�(sh霉)閲忛棞(gu膩n)绯荤反缈掞紙涓€锛�
鐎忚
鏀惰棌
涓嬮潰浜旈亾椤岃珛瑾嶇湡绶寸繏锛屽畬鎴愬悗鍙厡鎯呭弮鑰冪浜岄爜鐨勭瓟妗堣В鏋悀
1銆佹湁涓€闋呭伐绋�锛岀敳銆佷箼銆佷笝鍚堜綔涓€澶╁畬鎴愪簡宸ョ▼鐨�5/6锛屽凡鐭ョ敳銆佷箼銆佷笝鍠崹瀹屾垚閫欓爡宸ョ▼鎵€鐢ㄦ檪闁撳潎鐐烘暣鏁�(sh霉)澶╂暩(sh霉)锛屼笖鐢插柈鐛ㄥ畬鎴愰€欓爡宸ョ▼鎵€鐢ㄥぉ鏁�(sh霉)澶т簬涔�锛屼箼鎵€鐢ㄥぉ鏁�(sh霉)澶т簬涓�锛屽晱鐢层€佷箼鍚堜綔瀹屾垚鏁村€嬪伐绋嬮渶瑕佸咕澶�?
A.3
B.4
C.5
D.6
2銆佸缓绛戝叕鍙哥鐢ㄥ悐杌婂拰鍙夎粖鍚勮嫢骞茶紱锛屾瘡鏃ョ閲戠偤10钀厓銆傚凡鐭ュ悐杌婂拰鍙夎粖鐨勬棩绉熼噾鍒嗗垾鐐�1钀厓鍜�1500鍏冿紝鍟忓缓绛戝叕鍙告渶澶氱鐢ㄤ簡澶氬皯杓涘悐杌�?
A.6
B.7
C.8
D.9
3銆佽秴甯傞噰璩煎叐绋笉鍚屽彛鍛崇殑鏁ｈ宸у厠鍔涘叡X鏂�锛屽敭鍍瑰垎鍒ョ偤30鍏�/鏂ゅ拰50鍏�/鏂�锛岄爯(y霉)瑷堢附鏀跺叆鐐篩鍏�銆傚灏囧叾娣峰悎鍚庝互40鍏�/鏂ょ殑鍍规牸閵峰敭锛岀附鏀跺叆灏囩偤1.25Y鍏冦€傚晱閲囪臣浜�30鍏�/鏂ょ殑宸у厠鍔涘灏戞枻?
A.0.9X
B.0.95X
C.0.75X
D.0.8X
4銆佹煇闆烽仈绔欎綅浜庨粸O锛屽叾鏈夋晥鎺㈡脯鑼冨湇鐐轰互榛濷鐐轰腑蹇�锛屽崐寰�200鍏噷鐨勫湏褰€€傚湪榛濷鏉卞亸鍖楁柟鍚�锛岃垏榛濷鐩歌窛320鍏噷铏曟湁涓€鏋剁洿鍗囬姗�锛屼互300鍗冪背/灏忔檪鐨勯€熷害鍚戞瑗垮崡鏂瑰悜椋涜銆傚晱瑭查姗熸湁澶氬皯鍒嗛悩鍦ㄩ浄閬旂珯鐨勬湁鏁堟帰娓寖鍦嶄互鍏�(n猫i)?
A.40
B.44
C.48
D.50
5銆佷竴鏈浉鐨勭附闋佹暩(sh霉)鐐哄伓鏁�(sh霉)锛屽湪闋佺⒓鐨勬暩(sh霉)瀛椾腑“2”鍑虹従(xi脿n)浜�17娆�锛屽晱閫欐湰鏇哥殑闋佺⒓涔嬪拰鏈€澶氱偤锛�
A.1953
B.2346
C.2485
D.3240
1.A
瑙ｆ瀽
鏍规摎(j霉)椤屾剰锛屽亣瑷�(sh猫)宸ョ▼绺介噺鐐�6锛屽墖鐢�銆佷箼銆佷笝鏁堢巼涔嬪拰鐐�6×5/6=5锛屽凡鐭�3浜哄柈鐛ㄥ畬鎴愭墍闇€澶╂暩(sh霉)鐐烘鏁存暩(sh霉)锛屽墖宸ョ▼绺介噺鑳藉垎鍒ラ櫎浠ヤ笁浜虹殑鏁堢巼绲�(ji茅)鏋滄噳(y墨ng)鍧囩偤鏁存暩(sh霉)锛屽張宸茬煡涓変汉鍠崹瀹屾垚鎵€闇€澶╂暩(sh霉)鐢�>涔�>涓�锛屽墖鐢叉晥鐜�<涔欐晥鐜�<涓欐晥鐜�銆傜稖涓婏紝鍒ゅ畾鐢叉晥鐜囩偤0.5锛屼箼鏁堢巼鐐�1.5锛屼笝鏁堢巼鐐�3锛屽墖鐢�銆佷箼鍚堜綔瀹屾垚鏁村€嬪伐绋嬫墍闇€澶╂暩(sh霉)鐐�
澶�銆傛晠姝ｇ⒑绛旀鐐篈銆�
2.B
瑙ｆ瀽
鍋囪ō(sh猫)绉熺敤鍚婅粖鏁�(sh霉)閲忕偤x锛岀鐢ㄥ弶杌婃暩(sh霉)閲忕偤y锛屾牴鎿�(j霉)椤屾剰鍙緱鏂圭▼锛�1×x+0.15×y锛屽嵆20x+3y=200锛岃鎯硏鐩″彲鑳藉ぇ锛屽墖y鎳�(y墨ng)鐩″彲鑳藉皬锛岀祼(ji茅)鍚堟柟绋�锛�20x鑸�200鍧囩偤20鐨勬暣鏁�(sh霉)鍊�锛�3鑸�20浜掕唱(zh矛)锛屽墖y鎳�(y墨ng)鐐�20鐨勬暣鏁�(sh霉)鍊�锛寉鏈€灏忓€肩偤20锛屾鏅倄鍙栧緱鏈€澶у€�锛屾渶澶у€肩偤(200-3×20)÷20=7銆傛晠姝ｇ⒑绛旀鐐築銆�
3.A
瑙ｆ瀽
瑷�(sh猫)閲囪臣浜�30鍏�/鏂ょ殑a宸у厠鍔涙枻锛屽墖50鍏�/鏂ょ殑宸у厠鍔�(x-a)鏂�銆傜敱椤屾剰锛屽緱
鏁呮纰虹瓟妗堢偤A銆�
4.C
瑙ｆ瀽
濡傚彸鍦栨墍绀猴紝鐩村崌椋涙鍦ˋ榛炴部钁桝D鏂瑰悜缍�(j墨ng)閬庨浄閬旂殑鎺㈡脯鑼冨湇锛岀敱椤屾剰鍙煡锛岄姗熷湪CD娈甸琛岀殑鏅傞枔鍗崇偤鎵€姹�銆傞亷O浣淥B鍨傜洿浜嶥C銆�
鍏噷銆傚洜OC銆丱D閮界偤鍗婂緫锛屽墖鈻矯OD鐐虹瓑鑵颁笁瑙掑舰锛屾晠CD=2BC=2×120=240鍏噷銆傞姗熼€熷害鐐�300鍗冪背/灏忔檪锛岄偅涔堥姗熷皬鏅�锛屽嵆
0.8×60=48鍒嗛悩鍦ㄩ浄閬旂珯鐨勬湁鏁堟帰娓寖鍦嶄互鍏�(n猫i)銆�
鏁呮纰虹瓟妗堢偤C銆�
5.C
瑙ｆ瀽
鏁�(sh霉)瀛�2鍦�1-20涓�锛屽嚭鐝�(xi脿n)3娆�(2銆�12銆�20);鍦�21-30锛屽嚭鐝�(xi脿n)10娆�;31-40锛�41-50锛�51-60锛�61-70鍚勫嚭鐝�(xi脿n)1娆�锛岃嚦姝ゅ叡鍑虹従(xi脿n)3+10+4=17娆★紝鍐嶅線鍚庢暩(sh霉)鍒�72鍙堝嚭鐝�(xi脿n)绗�18娆�銆傜敱浜庨爜纰兼暩(sh霉)鐐哄伓鏁�(sh霉)锛屾晠鏈€澶ч爜鏁�(sh霉)涓嶈兘鐐�71锛屾渶澶у彧鑳界偤70锛屽墖闋佺⒓鏁�(sh霉)涔嬪拰鏈€澶氱偤1+2+3+……+70=
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