5. Ko'phadlar ayirmasini toping. 1) 4a²-b² va - a² + 3b² 3)-a² + 8b² va - 4a³-9b² 5)-1,2a + 2,4b va 1,6a - 4,7b

Ko'phadlar ayirmasini topish uchun birinchi ko'phaddan ikkinchi ko'phadni ayirish kerak. 1) $$(4a^2 - b^2) - (-a^2 + 3b^2) = 4a^2 - b^2 + a^2 - 3b^2 = (4+1)a^2 + (-1-3)b^2 = 5a^2 - 4b^2$$ Javob: $$5a^2 - 4b^2$$ 3) $$(-a^2 + 8b^2) - (-4a^3 - 9b^2) = -a^2 + 8b^2 + 4a^3 + 9b^2 = 4a^3 - a^2 + (8+9)b^2 = 4a^3 - a^2 + 17b^2$$ Javob: $$4a^3 - a^2 + 17b^2$$ 5) $$(-1.2a + 2.4b) - (1.6a - 4.7b) = -1.2a + 2.4b - 1.6a + 4.7b = (-1.2 - 1.6)a + (2.4 + 4.7)b = -2.8a + 7.1b$$ Javob: $$-2.8a + 7.1b$$