作者查詢 / oaoa0123
作者 oaoa0123 在 PTT [ Math ] 看板的留言(推文), 共120則
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3F推: https://i.imgur.com/NIbAwgL.jpg12/13 03:43
1F→: =1-n(有吃早餐或有電腦)=1-n(有吃早餐)-n(有電腦)12/06 17:27
2F→: +n(有吃早餐且有電腦)=1-1/4-2/5+1/8=0.47512/06 17:27
1F推: 6. 兩三角形同高時,面積與底邊成比例,故△BDF=10/10 14:21
2F→: (1/6)△BDC=(1/6)(1/2)△ABC=(1/12)△ABC,餘以此類10/10 14:22
3F→: 推,得△ADE=(1/6)△ABC,△CEF=(5/9)△ABC。10/10 14:22
4F→: 故△DEF=△ABC-△BDF-△ADE-△CEF=7/36△ABC。10/10 14:22
5F→: 13. 令3:4:5三角形中,除直角外之兩角為x,y, x<y,10/10 14:32
6F→: 所求即sin(y-x),依和角公式展開即可10/10 14:32
1F推: n(全)-n(甲無信or乙無信or丙無信),展開得10/10 14:09
2F→: 4^5-3*3^5+3*2^5-1=39010/10 14:10
7F推: https://i.imgur.com/N3ikho7.jpg10/08 20:17
1F推: 那就應該不是指直線吧03/04 19:56
8F推: http://i.imgur.com/5ldNtVI.jpg02/27 21:42
4F推: 我一看到題目馬上用 xyz=2^101 猜出x=2^-101/04 02:26
5F→: y=2, z=2^101 真‧高中生解法 XDDD01/04 02:27