(A)2006 (B)2005 (C)2004 (D)2003

2.A, B, C and D are mutually unequal positive integers, and a+b+c+d = 44 1, then the value of a+b+c+d is ().

30 (B)32 (C)34 (D)36

3. The lengths of three sides of a triangle are positive integers, and the length of the longest side is 10. Such a triangle has ().

(A)55 species (B)45 species (C)40 species (D)30 species.

4. It is known that m and n are real numbers and m2+2n2+m-n+= 0, then the square root of-mn2 is ().

(A) (B) (C) (D)

The number of students in grade one and grade two is the same in a school, and the number of students in grade three and grade two is the same. It is known that the number of boys in grade one is the same as that in grade two, and the number of boys in grade three accounts for the number of boys in grade three, so the number of girls in grade three accounts for the number of students in grade three ()

(A) (B) (C) (D)

6. As shown in figure 1, points E, F, G, H, M and N are on the side of BC, AC and AB of △ABC respectively, and NH∨MG∨BC, ME∨NF∨AC, GF∨eh∨AB.

(a) Black ants return to point F first; (b) Termites return to point F first.

(c) Two ants return to point F at the same time (d) Which ant returns to point F first depends on the position of each point.

7. If the sum of the internal angles of the convex polygon formed by cutting off an angle is 2520, then the number of sides of the original polygon is ().

(a)14 (b)15 (c)15 or 16 (D) 15 or 16.

8. Let A be the integer part and B be its decimal part. Let c be the integer part and d be the decimal part .. If ad-bc=m, then ()

(A)-2 < m