There are four nonzero natural numbers a, B, C, D, where C = a + B, d = B + C. If a can be divisible by 2, B by 3, C by 5, and d by 7, then D is the smallest______ ．

There are four nonzero natural numbers a, B, C, D, where C = a + B, d = B + C. If a can be divisible by 2, B by 3, C by 5, and d by 7, then D is the smallest______ ．

① From C = a + B and d = B + C, we can get d = B + A + B = a + 2B; ② from a can be divided by 2, so a is even; ③ from ① and ②, we can know that D must be even; ⑤ because D can be divided by 7, the requirement is the minimum, we can get the minimum of D is 28 from the minimum of a can be divided by 2 and B can be divided by 3

All four numbers are six digits, X is a natural number smaller than 10, y is zero, and the number that must be divisible by 2,3,5 at the same time is ()
A.XXXYXX
B.XYXYXY
C.XYYXYY
D.XYYXYX

All four numbers are six digits, X is a natural number smaller than 10, y is zero, and the number that can be divided by 2 / 3 / 5 at the same time is (b) a.xxxxx b.xyxyxyxy c.xyxyxyy d.xyxyxyx if you want to be divided by 2 / 3 / 5 at the same time, 1) must be divided by 2 / 5, the last bit must be 0,2) must be divided by 3, and the sum of all numbers can be divided by 3