ko thấy,sorry

A=2(x^2-2.5/4x+25/16)-50/16+7

A=2(x-√10/5)^2+31/8

Vì(x-√10/5)^2>=0 với mọi x

=>A>=31/8

Chọn B

đề bài là j

7B=7+7^2+7^3+...+7^2022

7B-B=(7+7^2+7^3+...+7^2022)-(1 + 7 + 7² + ... + 7²⁰²¹)

6B=7^2022-1

B=(7^2022-1)/6

multicultural

=x^m+2(3x^2+5x)

35.Tom has not read this book before

36.Have you ever joined such a big party?

1.Ko có a

2.knifes

3.does->is

4.didn't->weren't

đề bài là j

C