Question

1:-Add -3/7 and 2/3
2:-Add -5/6 and -3/11
3:-Subtract -1/3 from 11/5
4:-Subtract 2/5 from 7/9.​

Answer 1

Answer:

⋆ ANSWER ⋆

1.

$\frac{ - 3}{7} + \frac{2}{3} (lcm \: of \: 7 \: and \: 3 \: is \: 21) \\ = \frac{3 \times -( - 3)}{21} + \frac{7 \times 2}{21} \\ = \frac{ - 9 + 14}{21} \\ = \frac{5}{21}$

2.

$\frac{ - 5}{6} + \frac{ - 3}{11} (lcm \: of \: 6 \: and \: 11 \: is \: 66) \\ = \frac{( - 5) \times 11}{66} + \frac{6 (- 3)}{66} \\ = \frac{ - 55 - 18}{66} = \frac{73}{66}$

3. since it's SUBTRACTION so we write last one in forward

$\frac{11}{5} - \frac{ - 1}{3} (lcm \: of \: 3 \: and \: 5 \: is \: 15) \\ = \frac{(11)3}{15} - \frac{( - 1)5}{15} \\ = \frac{33 - 5}{15} \\ = \frac{28}{15}$

4.

$\frac{7}{9} - \frac{2}{5}(lcm \: of \: 9 \: and \: 5 \: is \: 54) \\ = \frac{7 \times 5}{54} - \frac{(2)9}{54} \\ = \frac{35 - 18}{54} \\ = \frac{17}{54}$