12*26+12*17 12*(26+17) 43 7
------------------ = ---------------- = ------ = 4 --
12*26-12*17 12*(26-17) 9 9
12 и 12 сокращаются
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12*26+12*17 12*(26+17) 43 7
------------------ = ---------------- = ------ = 4 --
12*26-12*17 12*(26-17) 9 9
12 и 12 сокращаются