80. If x and y are positive integers such that x = 8y + 12, what is the greatest common divisor of x and y ?
(1) x = 12u, where u is an integer.
(2) y = 12z, where z is an integer.
答案B. 如何推导
47, In the fraction x/y, where x and y are positive integers, what is the value of y ? (1),the least common denominator of x/y and 1/3 is 6 (2),x=1 答案E.. 不懂兰色部分什么意思!
(1),the least common denominator of x/y and 1/3 is 6
(2),x=1
答案E.. 不懂兰色部分什么意思!
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