Câu 1 : Xây dựng 1 chuỗi thức ăn có giun. Chỉ rõ thành phần chuỗi thức ăn.
Cau 2 : trong 1 quần xã sinh vật con mồi và vật ăn thith đều bị tiêu diệt với số lượng bằng nhau hỏi loài nào có khả năng phục hồi nhanh hơn về mặt số luog ? giải thích?
Thanks mn Sinh 9 ạ

Giair các bất pt sau

a> x2+4x>bằng0

b> x+3/3>0

c> x^2 -1 < bằng 0

d> x^2 +1 lớn hơn bằng 0

e> 4x^2-9 lơn hơn bằng 0

vẽ cả truc số nua nhé thanks mn

Read the passage and the questions or unfinished sentences. Mark the letter A, B, C or D on your answer sheet that you think fits best.

Computers have led to a greater change in our society in recent decades than any other force and are likely to continue to do so until the next century. The industry surrounding computers is growing quickly, providing employment for many but meanwhile making others redundant. Jobs that computers can do much more reliably, faster and cheaper are lost. The redeployment of labour and the prospect of increased leisure are causing social upheavals which require new ideas and significant changes of attitude.

According to the  passage, the impact computers have had on society ___________.

A. has exceeded that of any other technological development in recent times

B. has been unnecessarily exaggerated in recent years

C. has generally been confined to industrial life

D. will certainly continue to increase right through the next century

Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions.

I really regret that you haven't told me about her family.

A. If only you would tell me about her family

B. If only I didn't regret that you hadn't told me about her family

C. If only you had told me about her family

D. If only you hadn't told me about her family

A. limit

B. stop

C. avoid

D. remove

Thu gọn  125 a 3 3 ta được

A. 25a

B. 5a

C. −25 a 3

D. −5a

Cho hàm số f ( x ) = x 2 - x , đạo hàm của hàm số ứng với số gia Δx của đối số x tại  x 0 là:

A.  lim ∆ x → 0 ∆ x 2 - 2 x 0 ∆ x - ∆ x  

B.  lim ∆ x → 0 ∆ x + 2 x 0 - 1  

C.  lim ∆ x → 0 ∆ x + 2 x 0 + 1  

D.  lim ∆ x → 0 ∆ x 2 + 2 x 0 ∆ x + ∆ x