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Дано cd. Дано: ad = BC, ab = CD. Дано ad BC доказать ad BC. Дано ad=ab,<1=<2. Ad/BC =2/1 BC=.
Дано: ad = BC, ab = CD. Дано ad BC доказать ad BC. Дано ad=ab,<1=<2. Ad/BC =2/1 BC=.

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