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and 
. What is the absolute error of the sum?
and 
. What is the absolute error?
and 
. What is the absolute error of the sum?
, 
and
. What is the absolute error?
and 
.
, and the second student measured the distance of the upper edge of the picture and got 
. Calculate the area of the image and write down the absolute and relative error of the result. Round the result according to the number of digits.
