列方程解應(yīng)用題.
茶廠(chǎng)用A、B兩型機(jī)器同時(shí)生產(chǎn)一批相同的盒裝茶葉(由若干聽(tīng)包裝而成).已知3臺(tái)A型機(jī)器一天生產(chǎn)的聽(tīng)裝茶葉,包裝成20盒后還剩2臺(tái),2臺(tái)B型機(jī)器一天生產(chǎn)的聽(tīng)裝茶葉,包裝成15盒后還剩1聽(tīng),每臺(tái)A型機(jī)器比B型機(jī)器一天少生產(chǎn)4聽(tīng)茶葉.求每盒包裝多少聽(tīng)茶葉?

解:設(shè)每盒包裝x聽(tīng)茶葉.依題意得
+4=,
解得x=,
答:每盒包裝聽(tīng)茶葉.
分析:設(shè)每盒包裝x聽(tīng)茶葉.則每臺(tái)A型機(jī)器一天生產(chǎn)的聽(tīng)裝茶葉是聽(tīng),每臺(tái)B型機(jī)器一天生產(chǎn)的聽(tīng)裝茶葉是聽(tīng).則由“每臺(tái)A型機(jī)器比B型機(jī)器一天少生產(chǎn)4聽(tīng)茶葉”列出方程.
點(diǎn)評(píng):本題考查了一元一次方程的應(yīng)用.解題關(guān)鍵是要讀懂題目的意思,根據(jù)題目給出的條件,找出合適的等量關(guān)系列出方程,再求解.
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列方程解應(yīng)用題.
茶廠(chǎng)用A、B兩型機(jī)器同時(shí)生產(chǎn)一批相同的盒裝茶葉(由若干聽(tīng)包裝而成).已知3臺(tái)A型機(jī)器一天生產(chǎn)的聽(tīng)裝茶葉,包裝成20盒后還剩2臺(tái),2臺(tái)B型機(jī)器一天生產(chǎn)的聽(tīng)裝茶葉,包裝成15盒后還剩1聽(tīng),每臺(tái)A型機(jī)器比B型機(jī)器一天少生產(chǎn)4聽(tīng)茶葉.求每盒包裝多少聽(tīng)茶葉?

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