作业帮问八年级上册数学启东第14页第5题答案
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问八年级上册数学启东第14页第5题答案
问八年级上册数学启东第14页第5题答案
问八年级上册数学启东第14页第5题答案
在AB上取一点F使AF=AD
∵∠1=∠2,AE=AE
∴△ADE≌△AFE（SAS）
∴∠D=∠AFE
∵AD‖BC
∴∠D＋∠C=180°
又∵∠AFE+∠BFE=180°
∴∠C=∠BFE
又∵∠3=∠4,BE=BE
∴△BEC≌△BEF(AAS)
∴BC=BF
∴AD+BC=AF+BF=AB
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在AB上取一点F使AF=AD
∵∠1=∠2，AE=AE
∴△ADE≌△AFE（SAS）
∴∠D=∠AFE
∵AD‖BC
∴∠D＋∠C=180°
又∵∠AFE+∠BFE=180°
∴∠C=∠BFE
又∵∠3=∠4,BE=BE
∴△BEC≌△BEF(AAS)
∴BC=BF
∴AD+BC=AF+BF=AB 虽然是抄袭...
全部展开
在AB上取一点F使AF=AD
∵∠1=∠2，AE=AE
∴△ADE≌△AFE（SAS）
∴∠D=∠AFE
∵AD‖BC
∴∠D＋∠C=180°
又∵∠AFE+∠BFE=180°
∴∠C=∠BFE
又∵∠3=∠4,BE=BE
∴△BEC≌△BEF(AAS)
∴BC=BF
∴AD+BC=AF+BF=AB 虽然是抄袭，但希望吧分给我！谢谢！
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