Question

The value of
(7-1 - 8-) - (3-1 - 4-1) is​

Answer 1

---- , ----- = +

then (7+1-8)-(3+1+4-1)

=(8-8)-(4+4-1)

=7 Answer

Answer 2

$( \: 7 - 1 - 8 \: ) - ( \: 3 - 1 - 4 - 1 \: ) \\ ( \: 6 - 8 \: ) - ( \: 2 - 4 - 1 \: ) \\ ( \: - 2 \: ) - ( \: - 2 - 1 \: ) \\ ( \: - 2 \: ) - ( \: - 3 \: ) \\ \: add - ( - \: because \: minus \: multiply \: by \: minus \: is \: plus \\ ( \: - 2 + 3 \: ) \\ + 1 \\ therefore \: the \: answer \: is \: 1$