Susana25 Susana25 16-02-2016 Mathematics contestada Simplify: a) 3a²b + 4a²b - a²b = b) 3a²b + 4ab² + 2a²b = c) 3a²b + 4a² + a²b + 6a² = d) 3a²b +4a² + a²b + 6b² =