.k is a 2-digit positive integer, the value of k is 6 times of the unit digit, what is the value of k? (1). the ten digit is 4 greater than unit digit. (2). the sum of the two digits is a two-digit integer. 确认: .: D 确认: 感觉题有些怪解: 由题知:令k=10x+y,则 10x+y=6y => 2x=y I do not think u give the right answer. coz according to 1), x and y turn out to be negative. so 1) is not the option. what do u think? | 
