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Mathematical similarity of grade three
1.b 【 Two unknowns can be solved collectively and added. If they exceed, they will not be discarded.

2.B I doubt whether there are any mistakes in the topic. If it is a square, solve the equation. If it is a rectangle, solve the quadratic function.

3.b group discussion

4. C: The length of the hypotenuse midline is half that of the hypotenuse, ∴AD=BD=CD, ∴ C = ∠ DAC, ∫∠BAE+∠bad = 90, ∠DAC+∞.

5.D

E is EG∑AC, E and B are perpendicular to AC, and EM and BN are at m and n respectively.

∫EG∨AC

∴△DEG∽△DAC,

∴eg/AC = de/ad = DG/DC = 1/2∴AC = 2eg∴eg/fc = BG/BC = 2/3∴BD/BC = 1/3∴em。

6. d .∫s△ade = s trapezoidal DBCE, ∴△ADE's area is half that of △ABC ∴ (AD/AB) × (AE/AC) =1/2 ∴ AB = ∴ AD makes AD =/.

7. 1/4∧2005

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