急.列三元一次方程,要有过程的.有甲,乙,丙三种商品,若买甲3件,乙7件,丙1件,则共需580元;若买甲4件,乙10件,丙1件,则共需630元,若买甲,乙,丙各一件,则共需多少元?
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![急.列三元一次方程,要有过程的.有甲,乙,丙三种商品,若买甲3件,乙7件,丙1件,则共需580元;若买甲4件,乙10件,丙1件,则共需630元,若买甲,乙,丙各一件,则共需多少元?](/uploads/image/z/1854034-34-4.jpg?t=%E6%80%A5.%E5%88%97%E4%B8%89%E5%85%83%E4%B8%80%E6%AC%A1%E6%96%B9%E7%A8%8B%2C%E8%A6%81%E6%9C%89%E8%BF%87%E7%A8%8B%E7%9A%84.%E6%9C%89%E7%94%B2%2C%E4%B9%99%2C%E4%B8%99%E4%B8%89%E7%A7%8D%E5%95%86%E5%93%81%2C%E8%8B%A5%E4%B9%B0%E7%94%B23%E4%BB%B6%2C%E4%B9%997%E4%BB%B6%2C%E4%B8%991%E4%BB%B6%2C%E5%88%99%E5%85%B1%E9%9C%80580%E5%85%83%EF%BC%9B%E8%8B%A5%E4%B9%B0%E7%94%B24%E4%BB%B6%2C%E4%B9%9910%E4%BB%B6%2C%E4%B8%991%E4%BB%B6%2C%E5%88%99%E5%85%B1%E9%9C%80630%E5%85%83%2C%E8%8B%A5%E4%B9%B0%E7%94%B2%2C%E4%B9%99%2C%E4%B8%99%E5%90%84%E4%B8%80%E4%BB%B6%2C%E5%88%99%E5%85%B1%E9%9C%80%E5%A4%9A%E5%B0%91%E5%85%83%3F)
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