a) 2x² - 4x9.7x² + 3xy =
b) 2x y² + xy²³ - 3. (+ xy²¹)
c)-5ab + 2x² + 10 ab - 4ab + 54c² =
b) 2x y² + xy²³ - 3. (+ xy²¹)
c)-5ab + 2x² + 10 ab - 4ab + 54c² =
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a) 2x² - 4x9.7x² + 3xy = 2x² - 36x² + 3xy = -34x² + 3xy
b) 2x y² + xy²³ - 3. (+ xy²¹) = 2xy² + xy²³ - 3xy²¹ = xy²(2 + y - 3y) = xy²(-y + 2)
c) -5ab + 2x² + 10 ab - 4ab + 54c² = 2x² + (10ab - 5ab - 4ab) + 54c² = 2x² + ab + 54c²