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b) V = 2a³ + a²
a*a*h = 2a³ + a²
a²h = 2a³ + a² /:a²
h = 2a
c)P = 1/2a² + 3/2ab
a*h/2 = 1/2a² + 3/2ab /*2
ah = 1a² + 3ab /a
h = a + 3b