Odpowiedź:
1. 2xy + 4x²y - 5xy - 3x²y + 3xy = 0xy + 1x²y
2. 12 + ( n² - 2n ) - ( - 6n + 4n ² ) = 12 + n² - 2n + 6n - 4n² = 12 + 2² - 2 * 2 + 6 * 2 - 4 * 2² = 12 + 4 - 4 + 12 - 16 = 16 + 8 - 16 = 8
3. a ) ( 2x - 3 ) * ( 2x + 3 ) = 4x * 0 = 0 * x
b ) 2 ( x + y ) + 4 ( x - y ) = x + y + 4x - 4y = 5x - 3y
4. 4x - 1 * 2 + x + 4 * 2 = 8x - 2 + 2x + 8 = 10x + 6
