Răspuns:
Explicație pas cu pas:
a)
MN║BC→ΔAMN≈ΔABC→AM/AB= MN/BC→ 6/8=3/x=( 8*3)/4→X=24/4→x=4
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b)
AM/Ab=MN/BC→15/20=x/8→x=(8*15)/20 →x=6
c)
AN/AC= MN/BC→x/(x+1)=4/5→5*x=(x+1)*4→5x+4= 4x+4→5x-4x= 4→x= 4
