So sánh $\frac{4^{15}}{7^{30}}$ và $\frac{8^{10}.3^{30}}{7^{30}.4^{15}}$

Làm câu 6 thôi ạ tốt tính làm câu 7 cũng đc ạ hihi

Use conversion( đảo ngữ) to rewrite the sentences. 1. If I were in your place, I would make a trip to England.  2. If he hadn’t wasted too much time, he wouldn’t have failed in his examination last year.  3. If the car we saw yesterday had been larger, we would have bought it.  4. If I were you, I would save some of your lottery winning.  5. If I had taken the English course you offered, I would have made much progress. 

Giúp em với ạ , em đang cần gấp !

Underline the incorrect part in each sentence.( gạch chân lỗi sai) 1. If we will reduce the speed of population growth, there will be less pressure on the earth. 2. Unless we leave a bowl of water under the sun, it will evaporate. 3. If we continue to use fuels at the current rate, we would soon have to face a fuel crisis. 4. If I am 10 centimeters taller. I would play basketball. 5. If the doctors could find in the remedy, a lot of people would be saved. 6. If she bought that house now, she ran out of money. 7. What you would do if you could speak French well? 8. If I had known he is not at home. 1 wouldn’t have gone all the way to his house. 9. If I had known that the road were flooded, I would never have taken that way. 10. If I were you, I will go to the dentist’s and have the tooth checked.

Cho tam giác ABC, AM là trung tuyến. Vẽ đường thẳng d đi qua trung điểm I của AM cắt AB và AC. Gọi A', B', C' là hình chiếu vuông góc của A, B, C trên đường thẳng d. C/m AA'=(BB'+CC')/2

Giúp mình C22 với C25 ạ . Mình cảm ơn!

Bài 4: Rút gọn biểu thức sau: a)A= $\frac{a+b-2√ab}{√a-√b}$-$\frac{a-b}{√a+√b}$ b)B= $\frac{(√a+√b)²+4√ab}{(√a+√b)²-4√ab}$.$\frac{a-b}{(√a+√b)²}$

Rèn chữ địa phương và chữ Trung xem sao nhé Kèm thêm rèn chữ sáng tạo cho phần dịch"Ước muốn có đũa phép hồi sinh cho đời☺️☺️☺️

Cho nửa đường tròn (O) đường kính AB= 2R, dây cung AC. Gọi M là điểmchính giữa cung AC. Đường thẳng kẻ từ C song song với BM cắt tia AM ở K và cắt tiaOM ở D. OD cắt AC tại H. Chứng minh tứ giác CKMH nội tiếp.