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a) = x² + 2x + 4x + 8 = x² + 6x + 8
b) = -15x + 6x² - 20 + 8x = -7x + 6x² - 20
c) = 6 + 4√3 - 3√3 - 6 = √3
d) = -2√ab + b + 4a - 2√ab = -4√ab + b + 4a
4. / kreska ułamkowa
a) = 1/4 + 1/2x + x²
b) = -4a² - 4ab - 4ab + 4b² = -4a² - 8ab + 4b²
c) = 4 - 10x + 25x²
d) = 4a² + 2a + 2a + 1 = 4a² + 4a + 1
e) = 3ab - 9b² + a² - 3ab = a² - 9b²
f) = 4/9x² - 6/12y + 6/12y - 9/16y² = 4/9x² - 9/16y²