p = 2 (ab + bc + ac) wyznacz a
p = 2 (ab + bc + ac)
p=2ab+2bc+2ac|-2bc
2ab+2ac=p-2bc
a(2b+2c)=p-2bc|:(2b+2c)
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p = 2 (ab + bc + ac)
p=2ab+2bc+2ac|-2bc
2ab+2ac=p-2bc
a(2b+2c)=p-2bc|:(2b+2c)