For sets a and B. define the operation For sets a and B, define operations: a x B = {x | x = a * B, a ∈ a, B ∈ B}, C = a x B, let a = {1,2,3,4,}, B = {3,6,9} (1) If d = {x | x = 2k-1, K ∈ Z, X ∈ C}, the sum of elements in each subset of D is M1, M2, m3 , MK, M1 + M2 + m3 + mk ==== jiulang1989。 Second question?

For sets a and B. define the operation For sets a and B, define operations: a x B = {x | x = a * B, a ∈ a, B ∈ B}, C = a x B, let a = {1,2,3,4,}, B = {3,6,9} (1) If d = {x | x = 2k-1, K ∈ Z, X ∈ C}, the sum of elements in each subset of D is M1, M2, m3 , MK, M1 + M2 + m3 + mk ==== jiulang1989。 Second question?

Second question
C={3,6,9,12,18,24,27,36}
Then we define x = 2k-1, K ∈ Z, X ∈ C
The element in D is odd
So d = {3,9,27}
Its subset {3} {9} {27} {3,9} {3,27} {9,27} {3,9,27}
It's actually 4 * (3 + 9 + 27)