What about πx? = 18π, and x=3 gives the root number 2.
The diameter of the circle is 6 figures, 2 cm.
So the side length of a square is 6 and 2 cm.
2. Solution: According to the meaning of quadratic roots, the number of roots must be greater than or equal to zero, and 4-x? ≥0,
x？ ≤4, x≤2 is obtained, and x is a natural number, so the value of x is 0, 1, 2.
A: X has three values: 0, 1, 2 * * *.