na już pytanie drógie z załącznika
a) 2a + x²y - 5 - 3x²y + 4a = 6a - 2x²y - 5
b) 3/8m² + 2/3n + 1 - 0,2m² + 1/3n + 2 = 30/80m² - 16/80m² + n + 3 = 46/80m² + n + 3 = 23/40m² + n + 3
c) (-2a + 5b) · (3a + b) = -6a² - 2ab + 5ab + 5b² = -6a² + 5b² + 3ab
d) 15abc : (-3abc) = -5abc
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a) 2a + x²y - 5 - 3x²y + 4a = 6a - 2x²y - 5
b) 3/8m² + 2/3n + 1 - 0,2m² + 1/3n + 2 = 30/80m² - 16/80m² + n + 3 = 46/80m² + n + 3 = 23/40m² + n + 3
c) (-2a + 5b) · (3a + b) = -6a² - 2ab + 5ab + 5b² = -6a² + 5b² + 3ab
d) 15abc : (-3abc) = -5abc