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calculati :8supra7-15supra21+72supra56+2supra7

Răspuns :

simplifici cu 15/21 cu3=5/7,72/56 cu8=9/7:acum ai acelasi numitor:8/7-5/7+9/7+2/7=14/7=2
8/7-15/21+72/56+2/7=8/7-5/7+9/7+2/7=14/7=2