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20 10 the detailed problem-solving process of the 18 fill-in-the-blank problem in mathematics for the senior high school entrance examination in Suihua.
The three answers are

1. Take AC side as right angle side, extend BA to D, AC=AD, and connect CD. At this point BD=4.

2. Take the AC side as the right angle side, make CD perpendicular to C through point C, make AC=CD, and connect AD. At this time, BD=2 times the root number 5.

3. With the AC side as the hypotenuse, make the AD perpendicular to the CD at d .. At this time, BD= root sign 10.

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