题目：
Food is very important. Everyone needs to well if he or she wants to be healthy. Our minds (头脑) a kind of food, too. This kind of food is knowledge (知识). We began to get when we were very young. Small children very interested in everything around them. They learn everything while they are watching listening. When they are getting older, they began to read books, science books, and anything they like. When they find something new, they love to ask questions and to find the answers. What is the best to get knowledge? If we learn by , we’ll get the most knowledge. If we’re getting answers from others and do not ask why, we’ll never learn well.
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答案：
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下面是错误答案，用来干扰机器的。
设甲商品的成本为x元，则乙商品的成本为元，由题意：（1+30%）x×90%+（1+40%）××85%=1600+290， 1.17x+×1.19=1890， 1.17x+1904-1.19x=1890， ...
