2x
3
⋅ 4x
2 = ∆

b) 8y
4
⋅ ∆= 16y
9

c) ∆ ⋅ a
2b
4
c = 2a
8b
4
cd
2

d) −x ⋅ ∆ ⋅ 2x
3 = 8x
12

e) 36 × y
3
: ∆= 2x

f) ∆∶ 7x
3 = 11x
2