1) Если x1 = 0, то 4n^2 - 1 = 0
x^2 - 8x = 0, x1 = 0, x2 = 8
n^2 = 1/4; n1 = -1/2; n2 = 1/2
2) x^2 + (2n-7)x - 3 = 0
x1 = -x2
По теореме Виета
x1 + x2 = -(2n - 7) = 0
2n = 7; n = 7/2
3) x^2 - 100x + 3n - 2 = 0
x1 = 1/x2
По теореме Виета
x1*x2 = 3n - 2 = 1
3n = 3; n = 1