\(1+34=35\)

k mk 3 cái nha Phùng Đẳng Thức

Cho tam giác ABC vuông tại A, BD là phân giác của góc B. Vẽ DI vuông góc với BC (điểm I thuộc BC). Gọi K là giao điểm của hai đường thẳng DI và AB.

a) Chứng minh: ΔABD = ΔIBD.

b) Chứng minh: BD vuông góc AI.

c) Chứng minh: DK=DC

d) Cho AB=6cm, AC=8cm. Tính BC,CI

e) Lấy M là trung điểm của KC. Chứng minh B, D, M thẳng hàng.

Ta có (5n + 2)² - 4 = 5n² + 2² - 4

=> (5n + 2)² - 4 = 5n² chia hết cho 5

1. I must have my trousers ironed before the party.

2. Both of them are not old enough to get married.

1. You aren't old enough to drive a car.

2. She is good enough to pass this exam.

3. He does his work well enough to get promotion.

1. If you don't stop talking, you won't understand the lesson. 2. If you don't go right now, you'll be late for the train. 3. If I had enough free time, I could help my mother with the housework. 4. If the bus wasn't always so crowded, I would ride it to school every morning. 5. If the wind weren't blowing hard, they would take a boat out for a ride. 6. If I wanted them to be upset, I would tell them what happened. 7. If Carol hadn't been studying, she had answered the phone. 8. If Sally hadn't been absent from school on Friday, she will know what she has to do for homework. 9. If I had prepared for today's lesson, it won't be difficult for me to understand the teacher's explanation. 10. If Rita had got some sleep last night, she won't be exhausted today.

LẠi lộn nữa

70 x 70 = 4900

chúc bạn học tốt !

6: 2=3

25:5=5

2x3=6

5x5=25

ai k mình mình k lại

   \(\left(45-34-11\right)\times\left(56+54+87\right)\)

\(=0\times\left(56+54+87\right)\)

\(=0\)

tíc mình nha