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作者 Cortan 在 PTT [ juniorhigh ] 看板的留言(推文), 共19則
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3F→: (1) 連BD 角ABC 角ADC 分成兩個角 個別比大小05/07 13:01
4F→: (2) 連AC 解法同上05/07 13:02
1F→:答案 (B) ??05/10 22:59
5F→:甲:乙=AB:EF=5:7 => AB:EF:CD=5:7:905/10 23:04
7F→:上下兩個梯形面積比 (5+7):(7+9)=12:1605/10 23:05
10F→:丙:丁=7:9 => 丁:ABCD=9:(12+16)05/10 23:06
1F→:ABEC圓內接四邊形 => 角E+角BAC=180度 => 角E=角BAD02/10 16:50
2F→:又ABFD圓內接四邊形 =>角F+角BAD=180度02/10 16:51
3F→:角E+角F=角BAD+角F=180度 => CE//DF02/10 16:52
1F→:BAC~CAD(SAS) BC:CD=AB:BC=3:212/24 13:25
3F→:AEF=CDF => DE//AC => BE:EA = BD:DC12/24 14:44
4F→:連接BF 則四邊形BEFD面積被平分12/24 14:45
5F→:AF:FD = ABF:BDF = 3:1 => ACF:CDF = 3:1 => ACF = 312/24 14:46
7F→:BEF:AEF = BE:EA , BDF:CDF = BD:DC BE:EA = BD:DC =>12/24 15:24
8F→:BEF:AEF = BDF:CDF 又 AEF = CDF => BEF = BDF12/24 15:26
9F→:高? 哪些三角形?12/24 15:38
12F→:DE//AC => BE:EA =BD:DC12/24 15:41
13F→:AEF=CDF => AEC=CDA => CD//AC12/24 15:43
4F→:不好意思,想請問全等的條件?09/24 00:48
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