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  5. 不太清楚第5個選項，想問為什麼可以這樣解
Mathematics
Senior High
快被數學搞死
快被數學搞死

不太清楚第5個選項，想問為什麼可以這樣解

平面上相異n條直線,至多把平面分割成a,個區域,則下列哪些正確?(多選) n²+n+2 (1) a₁ =2 (2) a₂ =4 (B) a₁ =7 (4) a-a-1-n (5) an= 2 奪標題型 : 12345. 10-8=5 3216. Q2 9310= 575+2 7 z ✗ 22 2 4 1 16+4+2 91=2 9q=8 8 = an = anth 2 A2 = 4 93=6 05=10 An = 1+ (1+ 2+ ... + n) = n²+n+2 2. + Te-'80+
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