tính

\(\sqrt{2\sqrt{6}+5}.\sqrt{5-2\sqrt{6}}\)

A=( tháng 4 ; 5 ; 6)

B=( tháng 4 ; 6 ; 9 ; 11)

chuyển sang thể bị động

1.we can't make tea

2.did she help them yesterday?

3.people measure temperature with a thermometer

4.you must finish your task right now

5. they paint the gate once a year

6.she sells fool on the sidewalk

7.he write she a long letter

8. people plant rice in that country

cho tam giác ABC (góc A=90 độ) biết \(\frac{AB}{AC}=\frac{5}{6}\), đường cao AH =30cm.Tính HB,HC

sử dụng đúng thì hoặc dạng của động từ

1/ you can turn off the television. I(not/watch) .... it

2/ when i (open) .... the car door this morning, a cat (jump) ... out

3/ bod (hurt) ... his finger when he (cook) ... his dinner

4/ i (live) ... in london for 10 years while i (be) ... a child

5/ listen!some body (play) ... the piano. It's jenny she (play) ... piano every evening

6/ louise usually (phone) .... me on fridays, but she (not/phone) .... today

7/ we (go) .... to the cinema last night, but i (not/enjoy) .... the film much

8/ when we (see) ... mark, we (stop) ... the car

9/ when i last (see) ... alan, he (try) .... to find a job in london

10/ my brother (try) ... to find a job at the moment. It's very difficult

tìm min

B=5x²+2y²+4xy-2x+4y+2005

tìm max

D=1982-2x²-y²+2xy-10x+14y

tìm max

C=1983-x²-3y²+2xy-10x+14y

tìm min

A=\(x^2+y^2+xy-3x-3y+2006\)