1. rational number;

1 1 1 … 1 (200 1 1)222…2(200 1 2)÷333…3(200 1 3).

2. Algebraic expression;

It is known that y = ax 5+bx 3+CX+d, and when x=0, y = 3；; When x=-5 and y=9. When x=5, find the value of y.

3. Absolute value;

Let a and b be rational numbers, and | a | > 0, and the equation ||x-a|-b|=3 has three unequal real number solutions, so as to find the value of b.

4. One-dimensional linear equations;

Solve the equation: [4x+ 1]=3x- 1/3, where [a] represents the largest integer not exceeding a.

Answer; 1)33…34(2000 3)2)y =-33)b = 34)x =- 1 1/9，-8/9，-5/9。

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