(3/7-1/4) (2/3-3/5)+0,5

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вопрос

To solve this expression, we first need to find a common denominator for each pair of fractions:

(3/7 - 1/4) = (12/28 - 7/28) = 5/28
(2/3 - 3/5) = (10/15 - 9/15) = 1/15

Now we can add the two results and then add 0.5:

(5/28 + 1/15) = (75/420 + 28/420) = 103/420

Finally, we add 0.5 to the result:

103/420 + 0.5 = 103/420 + 210/420 = 313/420

Therefore, the final answer is 313/420.