(a/b-b/a):a-b черта дроби 3ab
(a/b-b/a):a-b/ 3ab = (a²-b²/ab):(a-b)/ 3ab = (a-b)(a+b)/ab*(a-b) /3ab = (a+b)/ab/3ab=
=(a+b)/ab*3ab=(a+b)/3a²b²
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(a/b-b/a):a-b/ 3ab = (a²-b²/ab):(a-b)/ 3ab = (a-b)(a+b)/ab*(a-b) /3ab = (a+b)/ab/3ab=
=(a+b)/ab*3ab=(a+b)/3a²b²