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b) 5mn²
c) 70xy
d) 12pq
e) 12abc
f) 8pqr
2. a) 21ab
b) 18m³
c) 6h²
d) 48s²
e) 48b²
f) -24tv²
3. a) 12r⁶
b) 36m⁸
c) -54t⁷
d) -10x¹²
e) 20z¹⁰
f) 20p⁸