14.7. Докажите тождество: 1) (200x*уз — 55х3у?) : (5x®y?) + 11 = 40xy;
2) 1,1а - (12,1a3b2 — 44a2b2): (11a2b2) = 4;
3) 1,6s4t: (0,04ѕ3t) - 41,22s = -1,22s;
4) (8,47nm4 + 77n+m3): (7,7nm3) - 10 = 1,1пт.​

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