As shown in the figure, the typhoon center of city a is 320km to the west of city a, and it moves in the direction of BF with a speed of 40km per hour and 60 ° to the East. The area within 200km from the typhoon center is affected by the typhoon. (1) is city a affected by the typhoon? Why? (2) If city a is affected by this typhoon, how long will city a be affected by this typhoon?

As shown in the figure, the typhoon center of city a is 320km to the west of city a, and it moves in the direction of BF with a speed of 40km per hour and 60 ° to the East. The area within 200km from the typhoon center is affected by the typhoon. (1) is city a affected by the typhoon? Why? (2) If city a is affected by this typhoon, how long will city a be affected by this typhoon?

(1) Let's make a vertical line from point a to BF, and the perpendicular foot is C. in RT △ ABC, ∠ ABC = 30 ° AB = 320km, then AC = 160km, because 160 ＜ 200, so city a will be affected by typhoon; (2) let's set D, Da = 200km, then there is a point G, Ag = 200km, because Da = AG, so △ ADG is isosceles triangle

There are 46 heads and 120 feet in the same cage. Let x chickens and Y rabbits be the same cage_______________
Absolute points

x+y=46
2x+4y=120
x=32,y=14

18 △ 6 = 3,
1. It means to divide 18 into three equal parts, each of which is 6
It means to divide 18 into 6 equal parts, each of which is 3
Which statement of judgment questions is right? Or are they all right? The key is how to say mathematics teaching now?
What about the following statement?
There are three sixes in 18
There are six threes in 18

It means to divide 18 into 6 equal parts, each of which is 3
It means to divide 18 into 6 parts, which can be divided into 3 parts
There are three sixes in 18
18 is three times of 6