Fcae考试问题
EM∨AB的通过点e,FN∨CD的通过点f,
∫AB∨CD,
∴ab∨em∨fn∨CD,
∴∠aem=∠1,∠mef+∠nfe=180,∠NFC=∠2,
∠∠MEF =∠2-∠AEM,∠NFE=∠3-∠NCF,
∴∠ 2+∠ 3 = ∠ 1+∠ 4+180或∠ 2+∠ 3-∠ 1-∠ 4 =
所以答案是:∠ 2+∠ 3 = ∠ 1+∠ 4+180或者∠ 2+∠ 3-∠ 1-∠ 4 =
∫AB∨CD,
∴ab∨em∨fn∨CD,
∴∠aem=∠1,∠mef+∠nfe=180,∠NFC=∠2,
∠∠MEF =∠2-∠AEM,∠NFE=∠3-∠NCF,
∴∠ 2+∠ 3 = ∠ 1+∠ 4+180或∠ 2+∠ 3-∠ 1-∠ 4 =
所以答案是:∠ 2+∠ 3 = ∠ 1+∠ 4+180或者∠ 2+∠ 3-∠ 1-∠ 4 =