Cho b khác c, a+b khác c và c^2+2ab-2ac-2bc=0.

RG: a^2 +(a-c)^2/b^2+(b-c)

Use the correct tense of the verbs given in the box to complete the text. '

1. earn 2. start 3. give 4.spend 5. give

6. provide 7. receive

Bill Gates, the founder of Microsoft, is one of the richest men in the world. In 2005, he(1) _________ $175 million. In 2000, his and his wife (2)__________ a charity called The Bill and Melinda Gates Foundation. So far they (3)____ about $28 billion of the fortune to the foundation. SInce 2000, the Foundation (4)__________ billions of dollars health and education. For example, in July 2000, it (5)______________ 40 million to scientists working on new ways to fight malaria. In May 2005, (6)_________ more tha $11 million for schools and collages Chicago. And since 2000, public libraries across the USA (7)_______ $ 250 million to pay for computer and internet access.

Cho đa thức f(x)=(m^2-1)x^3+(m-1)x^2-2x-1.

Tìm giá trị của hằng số m để đa thức có bậc bằng 2

So sánh:

a) -3/4 và 5/-6

b) a^2 và |-a^2|

Tam giác abc có 3 đường phân giác cắt nhau tại I. Kẻ đường thẳng vuông góc với AI tại I cắt AB tại M, ắt AC tại N.

CHứng minh: BIC=IMB

Chọn đáp án đúng cho các câu sau:

1.Children usually play video games in ____________.

A. libraries B. schools. C. classrooms D. arcades.

2. Hoa soon got ____________ the busy city traffic.

A.use to B. used to C. using to D. use of

3. We can only play games __________ a shorttime because we have a lot of homework to do tonight.