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Объяснение:

х = 1/15

3х = 3 * 1/15 = 3/15 = 1/5

5х = 5 * 1/15 = 5/15 = 1/3

(3 + 1/(3х) )*(5 - 1/(5х) ) =

(3 + 1/(1/5) )* (5 - 1/(1/3) )=

(3 + 1 : 1/5)*(5 - 1 : 1/3) =

(3 + 1 * 5/1)*(5 - 1 * 3/1) =

(3 + 5/1)*(5 - 3/1) =

(3 + 5)*(5 - 3) = 8 * 2 = 16