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4 × 2 × a × b
= 8 × a × b
= 8a × b
= ab
b.
-2 × (-3q) × (-4p)
= 6q × (-4p)
= -24pq
c.
3m × (-2mn)
= -6m²n
d.
7kn × 2m²n × (-3km)
= 14km²n² × (-3km)
= -42k²m³n²
e.
2p² × (-5qr) × (-8pr)
= -10p²qr × (-8pr)
= 80p³qr²
f.
-6ab² × 4a²b³ x (-2abc)
= -24a³b⁵ x (-2abc)
= 48a⁴b⁶c