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.