列方程并解答 买两种布料共138m,花了540元.其中篮布料每米3元,黑布料每米5元,两种布料个买
列方程并解答
买两种布料共138m,花了540元.其中篮布料每米3元,黑布料每米5元,两种布料个买了多少米?