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a) 20 : 4 = 5
odp. Bok ma długość 5 cm.
b) x : 4 = 0.25x
odp. Bok ma długość 0.25x
2.
0.5 + 0.5 * 15 + 4 * 0.5 =
0.5 + 7.5 + 2 =
10 cm
a) Ob = 4a
4a = 20
a = 5
b)
a = ¼x
2.
x = 1/2
Ob = ½ + 4 * ½ + ½ * ½
Ob = ½ + 2 + ¼
Ob = 2¾