Răspunsuri

2014-04-02T21:25:07+03:00
2a+2b=140=>a+b=70
a-b=10=>a=10+b
10+b+b=70=>2b=60=>b=30
a+30=70=>a=40
2014-04-02T21:30:13+03:00
Inlocuim. l=Latime iar L=Lungime . L-l=10. Iar 2L+ 2l= 140. Impartim relatia la 2 => L+l=70.
Acum am ajuns la o problema figurativa simpla :) Adica: L+l=70 L-l=10. Deseen:
70  \left \{ {{L = 1 segment+10} \atop {l=1 segment}} \right.
Oook. 70-10=60(2·l) . 60:2=30(l) 30+10=40(L)