Usage: 2 forms in 2 verses
Form Translated As     In Verse(s)
εξοπλίσησθε you should completely arm LXX.Num.32.20
εξοπλίσατε Completely arm LXX.Num.31.3

Liddell-Scott-Jones

ἐξοπλίζω (exoplizō) to completely arm G:V

ἐξοπλίζω-ίζω,

arm completely, [Refs 5th c.BC+]:—middle and passive, arm oneself, στολήν.. λέοντος, ᾗπερ.. ἐξωπλίζετο, of Hercules, [Refs 5th c.BC+]; get under arms, stand in armed array, [ἐξοπλίζωίσθητε 5th-6th c.BC: Xenophon Historicus “Institutio Cyri (Cyropaedia)” 6.3.32; ἐξωπλισμένος ">Refs 5th c.BC+]fully armed, [Refs 5th c.BC+]

__2 generally, ἐξωπλισμένος fully prepared, ready, [Refs 5th c.BC+]
__II disarm, deprive, Καίσαρα τῆς στρατιᾶς [Refs 2nd c.AD+]