初中的数学题目，谢谢大神
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(1)
D(0, 4), C(2, 0), CD的中点(1, 2), k = 1*2 = 2
B(0, -4), BC: x/2 + y/(-4) = 1, y = 2x - 4
(2)
y = 2/x = 2x - 4, x² - 2x - 1 = 0, x = 1±√2
M(1+√2, 2(√2 - 1)), N(1-√2, -2(1+√2))
(3)
令P(p, 2p -4), Q(p, 2/p)
显然PQ∥BD， 则需PQ = BD = 8
PQ = |2/p - (2p - 4)| = 8
p² + 2p - 1 = 0或p²
p = -1 ±√2或p = 3±√10
P(-1 ±√2, -6 ±2√2), P(3±√10, 2 ±2√10)
D(0, 4), C(2, 0), CD的中点(1, 2), k = 1*2 = 2
B(0, -4), BC: x/2 + y/(-4) = 1, y = 2x - 4
(2)
y = 2/x = 2x - 4, x² - 2x - 1 = 0, x = 1±√2
M(1+√2, 2(√2 - 1)), N(1-√2, -2(1+√2))
(3)
令P(p, 2p -4), Q(p, 2/p)
显然PQ∥BD， 则需PQ = BD = 8
PQ = |2/p - (2p - 4)| = 8
p² + 2p - 1 = 0或p²
p = -1 ±√2或p = 3±√10
P(-1 ±√2, -6 ±2√2), P(3±√10, 2 ±2√10)
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