Cho `triangleABC` có `hat{ABC}=45^@; hat{ACB}=30^@.` `CMR: AB:BC:AC=sqrt{2}:(1+sqrt{3}):2`

Cho `triangleABC` có `hat{ABC}=45^@; hat{ACB}=30^@.` `CMR: AB:BC:AC=sqrt{2}:(1+sqrt{3}):2`
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