42 = 32 + 24 - 2x
42 = 56 - 2x
42 - 56 = - 2x
- 14 = - 2x
2x = 14
x = 7cm ---------- odpowiedź
Obw ABCD = 42 cm
Obw BD = 32 cm
Obw ABD = 24 cm
32 cm + 24 cm = 56 cm
56 cm - 42 cm = 14 cm
14 cm : 2 = 7 cm
Sprawdź czy to dobra odp (jak masz dostep do odp)
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42 = 32 + 24 - 2x
42 = 56 - 2x
42 - 56 = - 2x
- 14 = - 2x
2x = 14
x = 7cm ---------- odpowiedź
Obw ABCD = 42 cm
Obw BD = 32 cm
Obw ABD = 24 cm
32 cm + 24 cm = 56 cm
56 cm - 42 cm = 14 cm
14 cm : 2 = 7 cm
Sprawdź czy to dobra odp (jak masz dostep do odp)