viet hon chinh cau thêm tu

1. he/like/sports/music

=> He likes playing sports and listening to music.

2.he/have/shortblack hair/round eyes

=> He has short black hair and round eyes.

3.we/first/meet/first day/at school

=> We meet on the first day at school.

4.we/often/ride/bicycles/school/together

=> We often ride bicycles to school together.

5.this sunday/we/going/judo club

=> This sunday, we are going to join judo club.

6. I /hope/we/will/have/a good time/then

=> I hope we will have more a good time then.

Trong cuốn đó có lời giải (sao bạn ko ra mục lục dò bài đó rồi dò lời giải, đều ở trong sách hết mà -_-)

Thì ra cái cuốn màu xanh dương -_-

Toán hình nâng cao phải ko

trời ơi, hít là hết đó mấy cha nội à

nâng cao (bài mấy, tên đề là gì)

Tính

(1/4-1).(1/9-1).(1/16-1).....(1/121-1)

\(\left(\frac{1}{4}-1\right).\left(\frac{1}{9}-1\right).\left(\frac{1}{16}-1\right).....\left(\frac{1}{121}-1\right)\\ =\frac{-3}{4}.\frac{-8}{9}.\frac{-15}{16}.....\frac{-120}{121}\)

\(=\frac{-1.3}{2.2}.\frac{-2.4}{3.3}.\frac{-3.5}{4.4}.....\frac{-10.12}{11.11}\)

\(=\frac{\left(-1.3\right).\left(-2.4\right).\left(-3.5\right).....\left(-10.12\right)}{2^2.3^2.4^2.....11^2}\\ =\frac{\left(-1\right).\left(-2\right).\left(-3\right).....\left(-10\right)}{2.3.4.....11}.\frac{3.4.5.....12}{2.3.4.....11}\)

\(=\frac{1}{2}.\frac{12}{11}\\ =\frac{6}{11}\)

vnen hay sgk thường (trang mấy, bài mấy nữa)