Selesaikan! a.(2ab) x (3a²b) x (ab) b.(x-2y) - (x+2y) Jawab secepatnya yaa!

a. (2ab) ×(3a^2b) ×(ab)
= 6a^4b^3

b. (x -2y ) ×(x+2y)
= x (x+2y) -2y (x+2y)
= x^2 + 2xy -2xy + 4y^2
= x^2 + 4y^2