meili 发表于 2022-10-27 15:27:05

已知,如图△ABC与△ADE中,D在BC上,∠1=∠2=∠3(1)求证:△ABC∽△ADE;(2)若AB=4,AD=2,AC=3,求AE的长.

<p>问题:已知,如图△ABC与△ADE中,D在BC上,∠1=∠2=∠3(1)求证:△ABC∽△ADE;(2)若AB=4,AD=2,AC=3,求AE的长.
<p>答案:↓↓↓<p class="nav-title mt10" style="border-top:1px solid #ccc;padding-top: 10px;">陶树平的回答:<div class="content-b">网友采纳  (1)证明:∵△ABC与△ADE中,D在BC上,∠2=∠3,∴∠E=∠C,∵∠DAE=∠DAC+∠2,∠BAC=∠DAC+∠1,∵∠1=∠2,∴∠DAE=∠BAC,∵∠1=∠3,∴∠B=∠ADE,∴△ABC∽△ADE;(2)∵△ABC∽△ADE(已证);∴ABAD=AEAC...
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查看完整版本: 已知,如图△ABC与△ADE中,D在BC上,∠1=∠2=∠3(1)求证:△ABC∽△ADE;(2)若AB=4,AD=2,AC=3,求AE的长.