某種中草藥含甲、乙、丙、丁四種草藥成分，這四種草藥成分的質量比是0.7∶1∶2∶4.7現(xiàn)在要配制這種中藥1400克，這四種草藥分別需要多少克？設每份為x克，根據(jù)題意，得________．

答案：
解析：

0.7x＋x＋2x＋4.7x＝1400


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