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	26/01 23:09:17
	Toán học - Lớp 6 \| Toán học \| Lớp 6

15. \(\left( \frac{1}{1.2.3} + \frac{1}{2.3.4} + \ldots + \frac{1}{8.9.10} \right) \cdot x = \frac{22}{45}\) 16. \(\frac{27 \cdot 5^{19} - 26 \cdot 4^{13}}{3^{19} + 59 \cdot 118} = \frac{1}{13.16} + \frac{1}{14.17}\) 17. Cho: \(A = \frac{1}{3.8} + \frac{1}{8.13} + \frac{1}{13.18} + \ldots + \frac{1}{33.38}\) \(B = \frac{1}{3.10} + \frac{1}{10.17} + \frac{1}{17.24} + \frac{1}{24.31} + \frac{1}{31.38}\) Tìm \(x\) biết: \(\left( \frac{28 \cdot 3^{7} - 27 \cdot 5^{9}}{8^{8}(x-4)} \right) \cdot (2^{25} + 5^{4.12}) = \frac{B}{A}\)

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15. \(\left( \frac{1}{1.2.3} + \frac{1}{2.3.4} + \ldots + \frac{1}{8.9.10} \right) \cdot x = \frac{22}{45}\)

16. \(\frac{27 \cdot 5^{19} - 26 \cdot 4^{13}}{3^{19} + 59 \cdot 118} = \frac{1}{13.16} + \frac{1}{14.17}\)

17. Cho:
\(A = \frac{1}{3.8} + \frac{1}{8.13} + \frac{1}{13.18} + \ldots + \frac{1}{33.38}\)
\(B = \frac{1}{3.10} + \frac{1}{10.17} + \frac{1}{17.24} + \frac{1}{24.31} + \frac{1}{31.38}\)

Tìm \(x\) biết:
\(\left( \frac{28 \cdot 3^{7} - 27 \cdot 5^{9}}{8^{8}(x-4)} \right) \cdot (2^{25} + 5^{4.12}) = \frac{B}{A}\)