Răspuns:
Explicație pas cu pas:
a/b = 7 si b/c = 5
a/c = ?
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a/b = 7 => b = a/7
b/c = 5
( a/7) : c = 5
(a/7 ) × 1/c = 5 => a/7c = 5 => a/c = 7 × 5 => a/c = 35
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a/b = 7 => a = 7 b
b/c = 5 => c = b/5
=> a/c = 7b/(b/5) = 7b × 5/b => a/c = 35b/b => a/c = 35
