2/a + 2/b = 7
(2b + 2a)/ab = 7
2(a + b)/ab = 7
(a + b)/ab = 7/2
ab/(a + b) = 2/7
Ответ: 2/7.
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Verified answer
2/a + 2/b = 7
(2b + 2a)/ab = 7
2(a + b)/ab = 7
(a + b)/ab = 7/2
ab/(a + b) = 2/7
Ответ: 2/7.