PΔ=a+b+c
1/5 + 1 5/6 + 2 7/10 = 6/30 + 55/30 + 81/30 = 61/30 + 81/30 = 142/30 = 4 22/30 = 4 11/15 м
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PΔ=a+b+c
1/5 + 1 5/6 + 2 7/10 = 6/30 + 55/30 + 81/30 = 61/30 + 81/30 = 142/30 = 4 22/30 = 4 11/15 м