BUENO

1. Multiplica:
 (–2xy)(–5x2y3 + 9x7y5 – 3x5y6)
 (–3x2y3)(9xy4 – 4x3y2 + 3xy)
 (–4x3y2)(8xy3 + 7xy2 – 4xy)
 (2xy)(3x2y4 – 4x2y3 + 6x2y)
 (3x2y)(–2x4y4 + 4x2y3 – 4x5y3)
 (7xy2)(5x3y3 – 3x2y4 + 5x4y7)
 (–2xy)(4x2y3 + 4y2x3 + 5x3y3)

2. Multiplica:
 (–6xy)(–7x2y3 + 9x7y5 – 3x5y6)
 (3x4y3)(9xy7 – 4x4y2 + 3xy)
 (–4x3y2)(8xy9 + 7xy6 – 4xy)
 (2x3y)(3x6y4 – 4x7y3 + 6x2y)
 (3x9y)(–2x4y7 + 4x6y3 – 4x5y3)
 (7x2y2)(5x6y3 – 3x8y4 + 5x4y7)
 (–2x2y)(4x2y7 + 4y2x9 + 5x3y3)