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–90 : 3= - 30
144 : 6= 24
(–90) : (–3)= 30
I. –3 ⋅ 2 ⋅ (–1) ⋅ (–5) = -30 = –90 : 3
II. 3 ⋅ (–2) ⋅ (– 5) = 30 = (–90) : (–3)
III. 2 ⋅ (–3) ⋅ (–4) = 24 = 144 : 6
IV. (–2) ⋅ (–3) ⋅ (–4) = -24 = 144 : (–6)