(1)双曲线过(2,0),其实轴为x轴,渐近线为y = ±bx/a = ±x/2
b/a = 1/2,a = 2b
x²/a² - y²/b² = 1
4/a² = 1,a = 2
b = 1
x²/4 - y² = 1
(2)
题目有问题,请改正