Răspuns :
8. x+x+5+5=3x
2x+10=3x, rezultaa ca x=10
10.
5*(20-x)=15*x
100-5x=15x, aduni 5 x
100=20x, deci x=5
2x+10=3x, rezultaa ca x=10
10.
5*(20-x)=15*x
100-5x=15x, aduni 5 x
100=20x, deci x=5
notam x=latura triunghiului
PΔ=3x
Pdreptunghi = 2x+5×2=2x+10
3x=2x+10
x=10
10
5(20-x)=15x
100-5x=15x
20x=100
x=5
PΔ=3x
Pdreptunghi = 2x+5×2=2x+10
3x=2x+10
x=10
10
5(20-x)=15x
100-5x=15x
20x=100
x=5