Question

[Giang Suri]

Tính giá trị các biểu thức sau:

\(A=\frac{-6}{5}+\frac{6}{19}-\frac{6}{23}\)\\(\frac{9}{5}-\frac{9}{19}+\frac{9}{23}\)

B=\(\frac{1}{6}-\frac{1}{32}+\frac{1}{51}\)\\(\frac{1}{8}-\frac{1}{32}+\frac{1}{58}\)

Answer 1

[✎﹏ミ★꧁༺вєѕт↭ℓαυяιєℓ↭νи༻꧂★ミ.༻(Trưở...]

\(A=-\frac{\frac{-6}{5}+\frac{6}{19}-\frac{6}{23}}{\frac{9}{5}-\frac{9}{19}+\frac{9}{23}}\)

\(=\frac{-6.\left(\frac{1}{5}-\frac{1}{19}+\frac{1}{23}\right)}{9.\left(\frac{1}{5}-\frac{1}{19}+\frac{1}{23}\right)}\)

\(=-\frac{6}{9}=-\frac{2}{3}\)