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nhanh nhé
----- Nội dung ảnh -----
5) \( \left( \frac{3}{15} + \frac{4}{10} + \frac{6}{20} \right) = \frac{30}{9} \)
6) \( \left( \frac{4}{12} + \frac{3}{10} + \frac{2}{15} \right) = \frac{11}{36} \)
7) \( A = -\frac{5}{8} \left( \frac{2}{3} + \frac{-7}{12} \right) \)
8) \( \frac{5}{6} + \frac{1}{6} \left( 12 - 5 - \frac{1}{3} \right) \)
9) \( \frac{7}{19} + \frac{8}{11} + \frac{7}{3} + \frac{12}{19} \)
10) \( \frac{8}{10} + \frac{9}{12} + \frac{15}{18} + \frac{12}{14} \)
11) \( \frac{5}{9} + \frac{7}{13} - \frac{5}{9} \)
12) \( \frac{5}{15} + \frac{4}{20} - \frac{9}{36} \)
Bài 2: Tìm x, biết:
----- Nội dung ảnh -----
5) \( \left( \frac{3}{15} + \frac{4}{10} + \frac{6}{20} \right) = \frac{30}{9} \)
6) \( \left( \frac{4}{12} + \frac{3}{10} + \frac{2}{15} \right) = \frac{11}{36} \)
7) \( A = -\frac{5}{8} \left( \frac{2}{3} + \frac{-7}{12} \right) \)
8) \( \frac{5}{6} + \frac{1}{6} \left( 12 - 5 - \frac{1}{3} \right) \)
9) \( \frac{7}{19} + \frac{8}{11} + \frac{7}{3} + \frac{12}{19} \)
10) \( \frac{8}{10} + \frac{9}{12} + \frac{15}{18} + \frac{12}{14} \)
11) \( \frac{5}{9} + \frac{7}{13} - \frac{5}{9} \)
12) \( \frac{5}{15} + \frac{4}{20} - \frac{9}{36} \)
Bài 2: Tìm x, biết: