efectuó las multiplicaciones indicadas 1. (-2)(+3)(-1)= 2. (-7)(-4)(-2)(-3)= 3. (-3x)(5x)= 4. (-4)(-5)(0)= 5.(2a)(-8a²)(-5a³)= 6. (-4m²n)(-7mn²)(-3m²n³)= 7.(-2m²)(-7m)(-9m²)= 8. (7ab)(2ab)(3ab)(5ab)= 9. (-4x²y³)(2xy²)(-3xy²)=​