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设A(a,0),B(a,b), F(a,b/2), E(e,b)
S-OAF = 1/4 ab
S-OCE=1/2 eb
S-OEBF = 3 = 3/4 ab - 1/2 eb
eb = 1/2 ab
S-OEBF = 3/4 ab - 1/4 ab = 1/2 ab = 3
ab = 6
1/2 ab = k = 3
S-OAF = 1/4 ab
S-OCE=1/2 eb
S-OEBF = 3 = 3/4 ab - 1/2 eb
eb = 1/2 ab
S-OEBF = 3/4 ab - 1/4 ab = 1/2 ab = 3
ab = 6
1/2 ab = k = 3
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