Question

pls ....pls pls help inthis question ............solve it step by step.....its answer is -5/72and of second -1/3 .......☆​

Answer 1

➨SolutiOn:

1)

$\frac{ - 2}{3} + \frac{1}{2} + \frac{ - 7}{9} + \frac{7}{8} \\ = \frac{ - 4 + 3}{6} + ( \frac{ - 56 + 63}{72} )$

$= \frac{ - 1}{6} + ( \frac{7}{72} ) \\ = \frac{ - 12 + 7}{72} \\ { \boxed{ \red{ = \frac{ - 5}{72} }}}$

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2)

$\frac{ - 3}{4} + \frac{2}{5} + \frac{ - 7}{12} + \frac{9}{15} \\ = \frac{ - 15 + 8}{20} + ( \frac{ - 35 + 36}{60} ) \\ = \frac{ - 7}{20} + \frac{1}{60} \\ = \frac{ - 21 + 1}{60} \\ = \frac{ - 20}{60} \\ \boxed{ \green{ = \frac{ - 1}{3} }}$

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Answer 2

Step-by-step explanation:

a) -2/3 + 1/2 + -7/9 + 7/8 (Make all denom. positive if required then find the lcm of denominators i.e Here LCM=72)

= -2/3 *24/24 + 1/2 * 36/36 + -7/9 * 8/8 + 7/8 * 9/9

= -48/72 + 36/72 + (-56/72) + 63/72

= -12/72 + (-56/72) + 63/72

= 51/72 - 56/72

= -5/72

Same method to be applied with other questions.

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