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2 intregi si 4/5 ·(2 intregi si 7/10·20/63 - 14/15:1 intreg si 3/25)

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CarMina03
2 4/5·(2  7/10·20/63-14/15:1  3/25)=14/5·(27/10·20/63-14/15:28/25)=14/5(6/7-14/15·25/28)=14/5·(6/7-5/6)=14/5·(36/42-35/42)=14/5·1/42=1/15

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