2. Упростите выражение: 0,8(2у + 3) – 1,2 ∙ (3у – 5) − 8,4
3. Докажите тождество: (5 – 3m) ∙ 2,3 + 7,6 ∙ (m – 2) – ( 0,1m – 2,7) = − 2
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