28n2-7m-m. 7(4n2-m2) —————— = ————— = 7 4n2-m2. 4n2-m2 (4n2-m2) сокращается
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28n2-7m-m. 7(4n2-m2) —————— = ————— = 7 4n2-m2. 4n2-m2 (4n2-m2) сокращается