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急 ! F4 Quadratic Equations
2011-10-01 10:30 pm
回答 (1)
2011-10-01 10:56 pm
✔ 最佳答案
41 Let the interest rate of the first is r The interest of second year = 50000(1 + r)(r + 0.01) = 3150
r^2 + 1.01r - 0.053 = 0
r = 0.05 or -1.06 (rejected)
48 AB + BC = 35 * 2 = 70 m
AC = 25 * 2 = 50 m
Since AB^2 + BC^2 = AC^2
AB^2 + (70 - AB)^2 = 2500
AB^2 - 70AB + 1200 = 0
(AB - 30)(AB - 40) = 0
AB = 30 or 40 (rejected)
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原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20111001000051KK00441