(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.