答案是D。但我感觉1),2)这两个条件好象没有用。
由xy≠0 = x≠0 且 y≠0, 因此x/y肯定不等于0。但是数据充分性的题,你不要管它有
没有用,意思是说如果(1)成立,你能推出结论吗?如果能,就ok.所以选D
22.On Jane’s credit card account, the average daily balance for a 30-day billing cycle is the average of the daily balances at the end of each of the 30 days.At the beginning of a certain 30-day billing cycle,Jane’s credit card account had a balance of $600.Jane made a payment of $300 on the account during the billing cycle.If no other amounts were added to or subtracted from the account during the billing cycle, what was the average daily balance on Jane’s account for the billing cycle?
1) Jane’s payment was credited on the 21st day of the billing cycle.
2) The average daily balance through the 25th day of the billing cycle was $540.
The key is D,but why?
考阅读的题,我读的很累,能不能翻译成中文:(
23. 1个正方形分成一些小格子(格子总数目已知),每个格子里有一个数字,求所有数字的平均数 1 已知各横向平均数的总和 2 已知各纵向平均数的总和令格子总数为 m*n 其中m为行数, n为列数
已知各横向的平均数总和,表示.所有数字和为 n(s1+s2+..+sm) 则平均数为
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