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39. One book store sold 100 books a seven day period. Saturday sold the most, Sunday is the second . Each day it sells different number of book. And every day, it sells at least 2. If Saturday sell 38 books, Which of the following can be the number of books sold on Sunday? I, 11, ii 42, III, forget it is not hard to calculate. I choose none.
此题设定是每天销售量不同,所以周1-5应该为2+3+4+5+6=20本,所以100-38-20=42 选ii I, 11, ii 42, III, forget it is not hard to calculate. I choose none.
此题设定是每天销售量不同,所以周1-5应该为2+3+4+5+6=20本,所以100-38-20=42 选ii
48.DS,两条线L和R的斜率相乘大余0吗?1)L&R都经过原点 2)L垂直于R 答案:B 我也不确定 x=0和y=0算吗?请教各位,谢谢!
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