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P=10*7,2=72
9h=72
h=8
P=72
Ob=2*9+2*10=18+20=38
P = 10 * 7,2 = 72
9 h = 72 / : 9
h = 8
P = 72
Ob = 2a + 2b
Ob = 2 * 9 + 2 * 10
Ob = 18 + 20
Ob = 38