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a² = a * 12 : 2
a² = 6a
a² - 6a = 0
a(a -6) = 0
a = 0 lub a-6 = 0
a=6
P = 6 * 12 : 2 = 6 * 6 = 36
odp: pole wynosi 36.
a²=a×12÷2
a²=6a /-6a
a²-6a=0
a(a-6)=0
a=0 lub a-6=0
a=0
P=6×12/2
P=72/2
P=36