wyznacz ze wzoru ,,b"
P=2ab+2ac+2bc
P=2ab+2ac+2bc|:2
½P=ab+ac+bc|:a
½P(kreska ułamkowa)a=b+c+bc/a|-c
½P-c/a=b+bc/a|*a
½P-c=b+bc|:c
½P-c/c=2b|:2
½P-c/2c=b
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P=2ab+2ac+2bc|:2
½P=ab+ac+bc|:a
½P(kreska ułamkowa)a=b+c+bc/a|-c
½P-c/a=b+bc/a|*a
½P-c=b+bc|:c
½P-c/c=2b|:2
½P-c/2c=b