chứng minh giúp em ạ! em cảm ơn

Giúp với đi ạ nghỉ hè quên mất rồi=((

Giúp tôi với tôi cần gấp ,giải giúp tôi

IX. Put the verb in the present perfect ( I have done ) or the part simple ( I did ) 1. My friend is a writer, she ...... ( writer) many books 2. .... ( you/see) Alan last week? 3. ... ( you/ever/be) to the United States? 4. What time ..... ( you/ go) to the Unites States 5. My hair is clean. I ... ( wash) it

Rewrite each of the follwing sentences so that its meaning remains unchanged, using the given words: 1 My parents don't allow me to play games on computer. ⇒ My parents don't let.............. 2 I had my friend answer the questions. ⇒ I got my friend............................ 3 He spent an hour doing his homework last night. ⇒ It took........... 4 Iam going to the post office . I want to send some letter ⇒ I am going to the post office in order............ 5 My grandfather is very weak. He can't lift the box ⇒ My grandfather is too.................. 6 My father said that I could use his car ⇒ My father allowed me 7 The sudden noise caused me to jump ⇒ The sudden noise made me 8 '' John, please don't tell anyone my new address'', said Mary ⇒ Mary told John 9 I don't really want to visit the museum. ⇒ I'd rather 10 Lan told Nam:'' Remember to send your parents my regard'' ⇒ Lan reminded Nam 11 The lesson was too long for us to learn by heart ⇒ The lesson wasn't short enough GIẢI GIÙM TUI CÁI NÀY TUI CẦN GẤP GIẢI ĐÚNG NHA KO COPY HAY SAO CHÉP XIN CẢM ƠN

Tại sao chúng ta phải nghiên cứu Tập tính động vật?

1) 2/x-y.√x^4.(x-y)^2 với x>y (căn hết) 2) √45.(x-6)^2/48 (căn hết cả phân số) 3)√9+12x+4x^2/y^2 với x> hoặc = -1,5; x<0 (căn hết cả phân số) 4) (x-y). √xy/(x-y)^2 với x<y<0 (căn hết cả phân số)

1.It is (rain) now. 2.I love (play) soccer. 3.They are (swim) at the moments.

Mọi người giúp em câu 53 và câu 55 với ạ Em xin cảm ơn!!!!

(2 phần 3 x-3):(-10)=2 phần 5. Ai giải giúp ạ