本题意思是：
三台拖拉机可以在三天之内犁地90000平方米,那么按照这种速度来计算,五台拖拉机在六天之内可以犁地多少平方米呢?
答案是:五台拖拉机六天可以犁地30万平方米.
英语类 英数题（意思）3 tractors can plough90000 square meters of field
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