Răspuns:
Explicație pas cu pas:
A_______M_______B_______________N_______________C
MC = MB + BN + NC = MB + 2BN = 17
AN = AM + MB + BN = 2MB + BN = 13
MB + 2BN = 17
2MB + BN = 13
2MB + 4BN = 34
2MB + BN = 13
2MB + 4BN - 2MB - BN = 34 - 13
3BN = 21
BN = 21 : 3 = 7 cm
MB = 17 - 2*7 = 17 - 14 = 3 cm
BC = 2BN = 2*7 = 14 cm
MN = MB + BN = 3 + 7 = 10 cm