Question

find-3/7+4/9+[-5/21]+2/3​

Answer 1

Answer:

$\frac{ - 3}{7} + \frac{4}{9} + ( - \frac{5}{21} ) + \frac{2}{3} \\ lcm = 63 \\ \frac{ - 3}{7} \times \frac{9}{9} = \frac{ - 27}{63} \\ \frac{4}{9} \times \frac{7}{7} = \frac{28}{63} \\ \frac{ - 5}{21} \times \frac{3}{3} = \frac{ - 15}{63} \\ \frac{2}{3} \times \frac{21}{21} = \frac{42}{63} \\ = \frac{ - 27}{63} + \frac{28}{63} + (\frac{ - 15}{63}) + \frac{42}{63} \\ = \frac{ - 27 + 28 + ( - 15) + 42}{63} \\ = \frac{28}{63} = \frac{4}{9}$