Answer:
-----×8
Explanation:
The sum in parentheses can be simplified by using the same denominator for all the fractions. If you notice, the 2/40 can already be simplified to 1/20, and the other denominators (5, 4) are factors of 20. This means 20 is a suitable common denominator.
Converting the fractions to have a denominator of 20, we get ...
... 4/5 = (4·4)/(5·4) = 16/20
... 3/4 = (3·5)/(4·5) = 15/20
and we already know ...
... 2/40 = (1·2)/(20·2) = 1/20
Then the sum in parentheses is ...
... (8 +16/20) -15/20 -1/20
... = 8 + (16/20 - 15/20) - 1/20
... = 8 + 1/20 - 1/20
... = 8
Note that as long as we keep the sign with the number, we can group the terms of a sum any way that is convenient.
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Often, you may find it convenient to add the negative terms before you subtract the result from the positive terms:
... = 8 + 16/20 -(15/20 +1/20) . . . . . note the -1 is factored out of the sum of negative terms so we're doing addition inside the parentheses
... = 8 + 16/20 -16/20
... = 8
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So, your result is ...
-----×((8 +4/5) -3/4 -2/40) = -----×8