1 等于(12*2=24) AB-AC=BC(即1/2AB=BC)BC/(1/2)=24
2 1(AB=6+4, AC=CB=5 BC-BD=5-4=1=CD
3 此题为错题,不可证。(若设C在B上)不设无步骤,去问你老师
4 EF=10 (AD=14 且AB:BC:CD=2:3:2 则AB占AD的2/7=4 BC占3/7=6 CD=4,且E为AB中点,F为C...
1 等于(12*2=24) AB-AC=BC(即1/2AB=BC)BC/(1/2)=24
2 1(AB=6+4, AC=CB=5 BC-BD=5-4=1=CD
3 此题为错题,不可证。(若设C在B上)不设无步骤,去问你老师
4 EF=10 (AD=14 且AB:BC:CD=2:3:2 则AB占AD的2/7=4 BC占3/7=6 CD=4,且E为AB中点,F为C...