Current location - Training Enrollment Network - Mathematics courses - Mathematical function topic
Mathematical function topic
Analysis: (1) According to the given analytical formula, the known function passes through the origin and point (60, 5), from which the answer can be obtained.

(2) The jogging speed of B is the slope of the resolution function of the distance S (km) traveled by B with respect to time T (min);

(3) After repairing the car, the driving distance is 3km, and it takes 20min minutes to get the speed;

(4) When Party A and Party B meet, the graph (1) is their intersection point, that is, find the intersection point and get the answer.

Solution: Solution: (1) The drawings are as follows:

(2) The jogging speed of B is the slope of the resolution function of the distance S (km) traveled by B with respect to time T (min).

that is

1

12

Kilometers per minute;

(3)A will drive for 20min after repairing the car, with a distance of 3km.

So the driving speed of A after repairing the car is 3÷20=

three

20

Km/min;

(4) According to the function image of the distance S (km) traveled by A relative to time t (min) and the function image of the distance S (km) jogged by B relative to time t (min):

Party A and Party B meet at a distance of 2km from Party A, when Party B has been driving for 2× 12=24 minutes.

That is, A and B meet 24 minutes after departure.

So the answer is:

1

12

three

20

; 24.

Analysis: First, according to the equation given in the question, find the length of both sides of △ABC, which is an isosceles triangle. We can get the answer by discussing the situation.

Answer: solution: from the meaning of the question: the length of both sides of △ABC is: x 1=2k, x2=k,

(1) If 4 is the base, 2k=k has no solution;

(2) If 4 is waist (1)x 1=4, then k = 2.

The three sides are 4, 4 and 2 respectively, and the perimeter is 10.

(2) If x2 = 4, then k=4,

The three sides are 4, 4 and 8 respectively, which cannot form a triangle, so they are discarded;

So when k=2, △ABC is an isosceles triangle with a perimeter of 10.