x? +5? =(X+ 1)?
The solution is X= 12.
The second picture: ∫AC = 10 BC = 8 AC = 6.
∴AC? =BC? + AC?
That is, △ABC is a right angle △
∴ 1/2BP*AC= 1/2BC*AB
That is BP=4.8.
Let Xh enter the territorial sea first, according to Pythagorean theorem
( 12.8X)? +4.8? =8?
Solution X=0.5 hours.
The third picture: Solution: Assuming that Xs can reach the top of the mountain, according to Pythagorean theorem.
800? + 1500? =(50X)?
X = 170/5 = 34 minutes
Picture 4: As can be seen from the title:
(1) after half an hour, the first group of distances is s1= 30 * 30 = 900 m.
The distance of the second group S2=40*30= 1200m.
900? + 1200? =2250000= 1500?
According to Pythagorean theorem, the included angle is a right angle.
(2) Solution: Suppose that after X minutes, the two groups meet.
30X+40X= 1500
X= 150/7 minutes
Thanks for your hard work, I hope to adopt it ~ ~ ~