选择题:如图,在△ABC中,AC=4,∠A=60°,∠B=45°,BC边的垂直平分线DE交AB于点D,连接CD,则AB的长为_________________.

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题目内容:

如图,在△ABC中,AC=4,∠A=60°,∠B=45°,BC边的垂直平分线DEAB于点D,连接CD,则AB的长为_________________.

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答案解析:

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﹣2的相反数是( )

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