Răspuns:
d)
[tex]2x + 3 {x}^{2} - 5x - (3 {x}^{2} ) = \\ \\ 2x + 3 {x}^{2} - 5x - 3 {x}^{2} = \\ - 3x - 6 {x}^{2} [/tex]
e)
[tex]24 {x}^{2} - (5x - 6x - 3 {x}^{2} - 10x) + ( - 3x) \times ( - 7) = \\ 24 {x}^{2} - ( - 11x - 3 {x}^{2} ) + 21x = \\ 24 {x}^{2} + 11x - 3 {x}^{2} + 21x = 27 {x}^{2} + 32[/tex]
f)
[tex]x \times x + x + x - {x}^{2} = \\ {x}^{2} + x + x - {x}^{2} = 2x[/tex]
g)
[tex]4x + 5x \times x - 25 {x}^{2} \div 5 {x}^{2} = \\ 4x + 5 {x}^{2} + 5 {x}^{4} [/tex]
