1: adbccbcdbc 2: 22, 74 degrees, 5, 3, a, root number 145, 13/2, 8, 7, 5 1 degree, root number 3+ 1 3: ab//. Ad//bc (same as above) ad//bc, ab//cd (complementary to the inner corner of the same side, two straight lines are parallel) 22, 23 Draw 24 by yourself, Xiao Wang: most Xiao Li: 9+9/2=9 rings. Median Xiao Zhang: 9+9/2=8 rings, with a median and average of 25. Solution: Because ab=ac, the square of ad bc ad=ad, and the triangle abd are all equal to acd(sss), the angle adc=adb=90 degrees, and because ae=ec, de=ae=ec, so ab is equal to 2de 26. 1. Solution. Because AB and CB. According to Pythagorean theorem, AC=4, because AB is 5cm, so AC=CB or CB=AB, so AC or AB must be equal to 3. If AC=CB is 1m/s, the sequence of C→B→A is 3+5+4-3=9m, that is, when t is 9, △BCP is an isosceles triangle. That is, when t is 5, △BCP is an isosceles triangle. 2. According to the meaning in the question, it takes 3+4+5= 12 seconds for point P to move. It is known that the length of point Q is twice that of point P, so when point Q arrives, point P is only the last question, but it is available on the Internet.

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