要有算术和方程解,急1、兔和鸭共100只,同在一饲养场,鸭的脚比兔的脚少70只,兔和鸭各多少只?(解释一下为什么这样做)?2、买2枝钢笔的价钱相当于买6枝圆珠笔的价钱.张华买3枝钢笔和5枝圆
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![要有算术和方程解,急1、兔和鸭共100只,同在一饲养场,鸭的脚比兔的脚少70只,兔和鸭各多少只?(解释一下为什么这样做)?2、买2枝钢笔的价钱相当于买6枝圆珠笔的价钱.张华买3枝钢笔和5枝圆](/uploads/image/z/1036382-14-2.jpg?t=%E8%A6%81%E6%9C%89%E7%AE%97%E6%9C%AF%E5%92%8C%E6%96%B9%E7%A8%8B%E8%A7%A3%2C%E6%80%A51%E3%80%81%E5%85%94%E5%92%8C%E9%B8%AD%E5%85%B1100%E5%8F%AA%2C%E5%90%8C%E5%9C%A8%E4%B8%80%E9%A5%B2%E5%85%BB%E5%9C%BA%2C%E9%B8%AD%E7%9A%84%E8%84%9A%E6%AF%94%E5%85%94%E7%9A%84%E8%84%9A%E5%B0%9170%E5%8F%AA%2C%E5%85%94%E5%92%8C%E9%B8%AD%E5%90%84%E5%A4%9A%E5%B0%91%E5%8F%AA%3F%EF%BC%88%E8%A7%A3%E9%87%8A%E4%B8%80%E4%B8%8B%E4%B8%BA%E4%BB%80%E4%B9%88%E8%BF%99%E6%A0%B7%E5%81%9A%EF%BC%89%3F2%E3%80%81%E4%B9%B02%E6%9E%9D%E9%92%A2%E7%AC%94%E7%9A%84%E4%BB%B7%E9%92%B1%E7%9B%B8%E5%BD%93%E4%BA%8E%E4%B9%B06%E6%9E%9D%E5%9C%86%E7%8F%A0%E7%AC%94%E7%9A%84%E4%BB%B7%E9%92%B1.%E5%BC%A0%E5%8D%8E%E4%B9%B03%E6%9E%9D%E9%92%A2%E7%AC%94%E5%92%8C5%E6%9E%9D%E5%9C%86)
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