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Senior high school entrance examination mathematics key kaodian
Knowledge point 1: the basic concept of unary quadratic equation

1. The constant term of the unary quadratic equation 3x2+5x-2=0 is -2.

2. The coefficient of the primary term of the unary quadratic equation 3x2+4x-2=0 is 4, and the constant term is -2.

3. The quadratic term coefficient of the unary quadratic equation 3x2-5x-7=0 is 3, and the constant term is -7.

4. Transform the equation 3x(x- 1)-2=-4x into the general formula 3x2-x-2=0.

Knowledge point 2: Cartesian coordinate system and the position of points

1. In the rectangular coordinate system, point A (3 3,0) is on the Y axis.

2. In the rectangular coordinate system, the abscissa of any point on the X axis is 0.

3. In rectangular coordinate system, point A (1, 1) is in the first quadrant.

4. In rectangular coordinate system, point A (-2,3) is in the fourth quadrant.

5. In rectangular coordinate system, point A (-2, 1) is in the second quadrant.

Knowledge point 3: Find the function value of the known independent variable.

1. When x=2, the function

y=3

2? The value of x is 1.

2. When x=3, the function

y=2

1? The value of x is 1.

3. When x=- 1, the function

y=

three

2 1

The value of x is 1.

Knowledge point 4: the concept and nature of basic functions

1. The function y=-8x is a linear function.

2. The function y=4x+ 1 is a proportional function.

three

. Function x

y

2 1?

This is an inverse proportional function.

4. The opening of parabola y=-3(x-2)2-5 is downward.

5. The symmetry axis of parabola y=4(x-3)2- 10 is x=3.

six

Parabola 2

) 1(2

12

Normal male karyotype

The vertex coordinate of is (1, 2).

seven

Inverse function x

y

2?

The images are in the first and third quadrants.

Knowledge point 5: mean, median and mode of data

The average value of 1. data 13, 10,12,8,7 is 10.

2. The pattern of data 3, 4, 2, 4, 4 is 4.

3. The median of data 1, 2,3,4,5 is 3.

Knowledge point 6: Special trigonometric function values

1.cos30

=

2

3.

sin260 +

cos260 =

1.

3.2sin30 +

tan45 =

2.

4.tan45 =

1.

5.cos60 +

sin30 =

1.