Răspuns:
Explicație pas cu pas:
a)
AM/AB= MN /BC
6/8= 3/x
x= (8*3)/6= 24/6
x=4cm
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b)
AM/AB=MN/BC
15/20= x/8
x= (8*15) /20
x= 120/20
x=6 cm
c)
AN/AC= MN/BC
x/(x+1) = 4/5
5*x=(x+1)*4
5x= 4x+4
5x-4x= 4
x=4 cm
