a=b,令3..PAB,AB的高为t,We have:
t/3=c/2a, (3)^2-t^2=c^2/4 and a^2-(3+t)^2=c^2. cancel a,c, we have Eq:7t^2+2t^3=9.
t=1 , So,..
a=b,令3..PAB,AB的高为t,We have:
t/3=c/2a, (3)^2-t^2=c^2/4 and a^2-(3+t)^2=c^2. cancel a,c, we have Eq:7t^2+2t^3=9.
t=1 , So,..
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老大厉害!!多谢了。欧看到几个二次的方程在一起就晕,以为有更简单的方法。
-tenteddies-
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05/31/2012 postreply
13:01:53
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不谢,有一气呵成的解法.一方程可也.但是脑要灵.
-jinjing-
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06/01/2012 postreply
20:22:20
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