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108=12x
x=9
2x=18
odp. Podstawy maja jedna 9 cm a druga 18 cm
1/2 * (x+2x) *4 = 54
6x = 54 / : 6
x = 9 - jedna podstawa
2*9 = 18 - druga podstawa
Odp. Jedna podstawa ma 9 cm a druga 18.
54=1/2*(a+b)*4
54=2*(a+b)
(a+b)=54:2
(a+b)=27
27:3=9
2*9+9=27