VITORIAZEFERINO880GO VITORIAZEFERINO880GO Matemática Respondido Simplify the expression. 1. (2x² – 6x) - (-2x² + 3x) 2. (5a? - a) - (2a - 5a) 4. (-2d? - d) - (5d- 50) 3. (4y2 + y) – (6y2 – 5y) 5. (2h + 5z) + 2H² +93) 6. (2y2 + 9xy) + (3y2 – 2xy)