2020骞村畨寰藉叕鍕�(w霉)鍝¤€冭│琛屾脯(c猫)鏁�(sh霉)閲忛棞(gu膩n)绯荤反缈�(x铆)锛堜簩锛�
鐎忚
鏀惰棌
1.鏌愯泲绯曟埧閵峰敭AB鍏╃ó绯曢粸(di菐n)锛屽叾鍠児(ji脿)鍧囩偤8鍏�锛屽柈鍊�(g猫)鍑堝埄娼�(r霉n)鍒嗗垾鐐�3鍏冨拰4鍏冦€傛帹寤ｆ湡鍏╃ó绯曢粸(di菐n)鍧囧叚鎶樺嚭鍞�銆傚鏌愬ぉ鍑哄敭X鍊�(g猫)绯曢粸(di菐n)锛屽晱(w猫n)鍏朵腑鑷冲皯瑕佹湁澶氬皯鍊�(g猫)B绯曢粸(di菐n)鎵嶈兘澶犱繚璀変笉铏ф湰( )
A.0.2X B.0.25X C.0.75X D.0.8X
2.鏌愯粖闁撴湁50鍚嶅伐浜鸿閰嶉浂浠讹紝鐢峰伐姣忎汉瑁濋厤4鍊�(g猫)锛屽コ宸ユ瘡浜鸿閰�2鍊�(g猫)锛屾渶绲傜敺宸ヨ閰嶇殑闆朵欢鏁�(sh霉)姣斿コ宸ュ20鍊�(g猫)銆傝粖闁撴簴(zh菙n)鍌欏緸鐢峰伐鍜屽コ宸ヤ腑鍚勪换鎰忛伕鎿�1鍚嶅弮鍔犳妧鑳芥瘮璩�锛屽晱(w猫n)鍏辨湁澶氬皯绋笉鍚岀殑绲勫悎( )
A.400 B.500 C.600 D.800
1.銆愯В鏋愩€慉銆傛墦鎶樺墠锛屽敭鍍�(ji脿)鐐�8鍏冿紝A铔嬬硶鍒╂饯(r霉n)鐐�3鍏�锛孊铔嬬硶鍒╂饯(r霉n)鐐�4鍏�锛屽墖A銆丅铔嬬硶鐨勬垚鏈垎鍒ョ偤8-3=5鍏�锛�8-4=4鍏�;鎵撴姌鍚庡敭鍍�(ji脿)鐐�8×0.6=4.8鍏�锛岃€孉銆丅铔嬬硶鐨勬垚鏈笉璁�锛屽墖鍒╂饯(r霉n)璁�?y艒u)閿筹細4.8-5= -0.2鍏�锛孊锛�4.8-4=0.8鍏�锛屽叿楂旇(ji脿n)涓嬭〃锛�
鍓囧彲鐭ヨ常涓€鍊�(g猫)A铔嬬硶铏ф湰0.2鍏冿紝璩ｄ竴鍊�(g猫)B铔嬬硶璩�0.8鍏�锛屽亣瑷�(sh猫)璩铔嬬硶a鍊�(g猫)锛孊铔嬬硶b鍊�(g猫)锛岃嫢鎭板ソ涓嶈櫑涓嶈澈锛屽墖0.2a=0.8b锛宎=4b锛岀附鏁�(sh霉)X=a+b=4b+b=5b锛屽嵆b=0.2X銆傛晠姝ｇ⒑绛旀鐐篈闋�(xi脿ng)銆�
2.銆愯В鏋愩€慍銆傝ō(sh猫)鐢峰伐浜烘暩(sh霉)鐐簒浜�锛屽コ宸ヤ汉鏁�(sh霉)鐐簓浜�锛屽墖鍙緱鈶爔+y=50锛屸憽4x-2y=20锛岃伅(li谩n)绔嬧憼鈶℃眰瑙ｅ彲寰楀埌x=20锛寉=30銆傚墖寰炵敺宸ヤ腑浠绘剰鎶藉彇涓€浜虹殑绲勫悎鐐�20绋紝寰炲コ宸ョó浠绘剰鎶藉彇涓€浜虹殑绲勫悎鐐�30绋�锛屽墖绺界祫鍚堟暩(sh霉)鐐�20×30=600绋€傛晠姝ｇ⒑绛旀鐐篊闋�(xi脿ng)銆�
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