Respostas

  • Usuário do Brainly
2014-07-28T23:25:04-03:00
(3x + 10y)² = 9x² + 60xy + 100y²
2014-07-28T23:25:50-03:00
(3x)² +2* (3x)*(10y)+(10y)²=
9x²+60xy+100y²