Question

please anyone solve these questions please and if anyone do not know please don't answer ​

Answer 1

Step-by-step explanation:

7)Add:

1)

$\frac{3}{7} + \frac{ - 9}{7 } = \frac{3 + ( - 9)}{7} = - \frac{6}{7}$

2)

$\frac{5}{9} + \frac{7}{ - 9 } = (first \: convert \: negative \: denominator \: into \: positive) \\ \frac{5}{9} - \frac{7}{9} = \frac{5 - 7}{9} = \frac{ - 2}{9}$

3)

$\frac{2}{5} + \frac{5}{ - 9} + \frac{ - 6}{15} (reduce \frac{ - 6}{15}into \: simple \: form) \\ \frac{2}{5} + \frac{5}{ - 9} - \frac{2}{5} = \frac{2}{5} - \frac{2}{5} + \frac{5}{ - 9} \\ 0 + \frac{5}{ - 9} = 0 - \frac{5}{9 } \\ = - \frac{5}{9}$

Simplify:

1)

$\frac{ - 2}{1} + \frac{3}{8} + \frac{ - 1}{5}(lcm \: of \: 8and5 = 40) \\ \frac{ - 80 + 15 - 8}{40} = \frac{ - 73}{40} \\ \frac{ - 73}{40} = - 1 \frac{33}{40}$

2)

$\frac{2}{3} + \frac{ - 7}{11} + \frac{ - 1}{4} = lcm \: of \: 3 \: \: 11and4 = 132 \\ \frac{88 - 84 - 33}{132} = \frac{ - 29}{132} \\ - \frac{29}{132}$

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