Question

please help
I wil brain list you
don't post useless answees​

Answer 1

Answer:

1.answer is 1

2.answer is _20/15

Step-by-step explanation:

A.take lcm 2,3,6=6

-1/2+2/3+5/6=

-3+4+5/6=6/6=1

B.take lcm of 15,5,3 answer is 15

7/15+(_4/5)+2/3=

7_12+15/15=

7_27/15=

answer is a -20/15

Answer 2

Answer:

$b) \: \: \frac{7}{15} , \frac{-4}{5} , \frac{2}{3} \\ = > a + (b + c) \: = \: (a + b) + c \\ = > \frac{7}{15} + ( \frac{ - 4}{5} + \frac{2}{3} ) = ( \frac{7}{15} + ( \frac{ - 4}{5} )) + \frac{2}{3} \\ = > \frac{7}{15} + ( \frac{ - 12 + 10}{15} ) = ( \frac{7 - 12}{15}) + \frac{2}{3} \\ = > \frac{7}{15} + \frac{ - 2}{15} = \frac{ - 5}{15} + \frac{2}{3} \\ = > \frac{7 - 2}{15} = \frac{ - 5 + 10}{15} \\ = > \frac{5}{15} = \frac{5}{15} \\ = > \frac{1}{3} = \frac{1}{3} \\ = > \frac{1}{3} \: is \: equal \: to \: \frac{1}{3} \\ = > so \: it \: is \: pair \: of \: associative \: property.$

$a) \: \: \frac{ - 1}{2} , \frac{2}{3} , \frac{5}{6} \\ = > \: a + (b + c) = (a + b) + c \: \\ = > \frac{ - 1}{2} + ( \frac{2}{5} + \frac{5}{6} ) = ( \frac{ - 1}{2} + \frac{2}{3} ) + \frac{5}{6} \\ = > \frac{ - 1}{2} + ( \frac{12 + 25}{30} ) = ( \frac{ - 3 + 4}{6} ) + \frac{5}{6} \\ = > \frac{ - 1}{2} + \frac{37}{30} = \frac{1}{6} + \frac{5}{6} \\ = > \frac{ - 15 + 37}{30} = \frac{1 + 5}{6} \\ = > \frac{22}{30} = \frac{6}{6} \\ = > \frac{11}{15} = 1 \\ = > \frac{11}{15} \: \: is \: not \: equal \: to \: 1 \\ = > so \: it \: is \: not \: pair \: of \: associative\: property \: of \: addition$

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Step-by-step explanation:

Hope it's helpful to you :) :)