2020骞村畨寰藉叕鍕�(w霉)鍝¤€冭│琛屾脯鏁�(sh霉)閲忛棞(gu膩n)绯荤反缈�(x铆)锛堜簩锛�


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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�锛岀敺宸ユ瘡浜鸿閰�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斤紝鍟忓叡鏈夊灏戠ó涓嶅悓鐨勭祫鍚�( )
A.400 B.500 C.600 D.800
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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�锛屽緸濂冲伐绋换鎰忔娊鍙栦竴浜虹殑绲勫悎鐐�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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