nH2 = x + y/2 = 0,25 (1) m hh = 137x + Ry = 23 (2) 0,09 < x < 0,105 (3) Từ (1) và (2) → x=$\frac{0,5R-23}{2R-137}$ (4) lam sao ma tu 1 voi 2 ra duoc 4 a

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