Question

Please solve it..


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Answer 1

Answer:

simply take the lcm and solve as usual

Answer 2

Answer:

$(1.) \frac{1}{3} + 2 \frac{1}{3} + \frac{5}{7} \\ = \frac{1}{3 } + \frac{7}{3} + \frac{5}{7} \\ = \frac{7 + 49 + 15}{21} \\ = \frac{71}{21} \\ = 3 \ \frac{8}{21} or3.380952381 \\ \\ (2.) \frac{4}{7} - \frac{8}{14 } \\ = \frac{8 - 8}{14} \\ = \frac{0}{14} \\ 0 \\ \\ (3.) \frac{1}{120} - \frac{3}{140} + \frac{5}{10} \\ = \frac{7 - 6 + 84}{840} \\ = \frac{85}{840} \\ = \frac{17}{168} \\ = 0.1011904762$