AOD area = x. ABD is twice of ADE, so
40+x=2*(x+12). x=16
ABO/BOE=AOD/DOE. So, 40/BOE=16/12. So, BOE=30
DBE=BEC. So, 12+30=42=BEC
Total=140
AOD area = x. ABD is twice of ADE, so
40+x=2*(x+12). x=16
ABO/BOE=AOD/DOE. So, 40/BOE=16/12. So, BOE=30
DBE=BEC. So, 12+30=42=BEC
Total=140
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好!我也有类似解法,我连了AC,因为ABD和ACD面积相同, 即x+40=2(x+12),接下去差不多
-万斤油-
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03/29/2026 postreply
19:33:10
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嗯,看到不同的解法,我总能学到点新视角
-monseigneur-
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03/29/2026 postreply
20:29:18
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