3 Определите верные равенства и объясните/покажите, почему они верные: а) 12 + 6 = 15 + 3
б) 17 + 5 = 2 · 11
в) 2 + 12 = 10 + 1
г) (30,5 – 4 · 2,4) : (–0,87 – 0,23) = –10 – 30 · 0,3
д) 71 – 12(1 – 3(14 – 5)) = 23 – (12 + (–3) · 3) – (–5)
е) 1,22 + 1,52 = 1,32 + 1,42
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