A odd function decreases in (-∞, 0), and b odd function increases in (-∞, 0).

C even function decreases within (0, +∞), and D even function increases within (0, +∞).

2. If the image of the proportional function passes through the point (2, -6), the expression of the function is.

3. In the following functions, (-2,8) is ().

a、y= -4x B、y= 3x-2 C、y= D、y = 4x

4. If the linear function f(x) satisfies the conditions f (2) = 5 and f (3) = 7, the function expression is.

5. If the linear function f(x) satisfies the condition f (1) =-2 and f (2) = 0, the function expression is.

6. If the linear function y=f(x) satisfies the condition f (2) = 1 and f (3) = 4, then f(4)= (). .

a4 b . 5 c . 6d . 7

7, in the following functions, belongs to the proportional function is ().

a、y = -3x B、y = 2+3x C、D、

8. Among the following functions, (0, +∞) is a decreasing function ().

a、B、C、D、y = 3x

9. Images with linear function y = 3-2x do not pass through the fourth quadrant.

10, if k < 0 and b < 0, then the straight line y = kx+b does not pass through the first quadrant.

1 1, if k < 0 and b > 0, then the straight line kx +y+ b=0 is not the first quadrant.

12: it is known that f(x) is a proportional function and f( 1)= -2, then f(x) = ().

A.2x B.-2x C.x/2 D.-x/2

13: the function y=f(x) is an inverse proportional function. If f(2)=4, then f(3)=.

14: It is known that y=f(x) is a linear function. If f (2) = 8 and f (-6) = 4, then f(22)= 1.