Ayuda porfa para hoy prfaaa?

1) ab / a + b = 2piden calcular E = (a + b)² - a² - b² / (a + b)resolviendoE = a² + 2ab + b² - a² - b² / (a + b)E = 2ab / (a + b)como ab / a + b = 2reemplazamos en EE = 2(2)E = 42)4x ^ 20 + 12x ^ 10y14 + 9y ^ 28 = (Ax ^ m + By ^ n)²4x ^ 20 + 12x ^ 10y14 + 9y ^ 28 = A²x ^ 2m + 2(Ax ^ m)(By ^ n) + B²y ^ 2nigualando terminos semejantes4x ^ 20 = A²x ^ 2mA² = 4 A = 22m = 20m = 109y ^ 28 = B²y ^ 2nB² = 9B = 32n = 28n = 14piden A + B + m + nreemplazando2 + 3 + 10 + 14 293) a + c = bremplazamosa² + (a + c)c / ac - (a + c)²a² + ac + c² / ac - a² - 2ac - c²a² + ac + c² / - a² - ac - c²a² + ac + c² / - ( a² + ac + c²) - 14) x + y = 5elevamos al cuadrado(x + y)² = 5²x² + 2xy + y² = 259 + 2xy = 252xy = 16xy = 8(x + y)² + (x - y)² = 18x² + 2xy + y² + x² - 2xy + y² = 182(x² + y²) = 18x² + y² = 9hallar xy + x²y² + 18 + 64 + 1 = 735) (x + 1)(x + 2)(x + 3)(x + 4) - (x² + 5x + 5)²(x² + 3x + 2)(x² + 7x + 12) - (x² + 5x + 5)²x ^ 4 + 7x³ + 12x² + 3x³ + 21x² + 36x + 2x² + 14x + 24 - ( x ^ 4 + 25x² + 25 + 10x³ + 10x² + 50x)x ^ 4 + 10x³ + 35x² + 50x + 24 - ( x ^ 4 + 10x³ + 35x² + 50x + 25)x ^ 4 + 10x³ + 35x² + 50x + 24 - x ^ 4 - 10x³ - 35x² - 50x - 25 - 1.