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a) (2a²-a+3)·(-4a)+16(a²-0,5)=
b) (2x²-5xy+4)·2xy-7xy=
c) (-4x²+12x³y²-16x⁴y³)÷(-4x²)=
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a) (2a²-a+3)·(-4a)+16(a²-0,5) =-8a³ + 4a² - 12a + 16a² - 8 = -8a³ + 20a² - 12a - 8
b) (2x²-5xy+4)·2xy - 7xy =4x³y - 10x²y² + 8xy - 7xy = 4x³y - 10x²y² + xy
c) (-4x²+12x³y²-16x⁴y³)÷(-4x²) = 1 - 3xy² + 4x²y³