对啊,这里说的是3150乘以某个数之后,是某个整数的平方。 但是OG的做法是啥意思? 先把3150因式分解,3150= 2 × 5 × 3 × 5 × (3 × 7) 然后说: To be a perfect square, 3,150y must have an even number of each of its prime factors. At a minimum, y must have one factor of 2 and one factor of 7 so that 3,150y has two factors of each of the primes 2, 3, 5, and 7. Th e smallest positive integer value of y is then (2)(7) = 14.