条件1, 1xr=1, 8-1=7,7/2=3+remainder 1, indicates that at least 2 r were made. Result: 2r+3p, 9x3+1x2=29, at least, not sufficient, (if p and r are integers).
条件2,P比r多,和条件一差不多。。。也是not sufficient。作者: changjiangtao 时间: 2011-5-4 06:31
谢谢啊,那r如果卖3块钱是不是第一个条件就充分了啊
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