Tính
\(A=\frac{3}{\sqrt{3}}+\frac{2\sqrt{3}}{\sqrt{3}+1}\) \(B=\frac{\sqrt{15}-\sqrt{12}}{\sqrt{5}-2}-\frac{1}{2-\sqrt{3}}\)
\(C=\frac{5+2\sqrt{5}}{\sqrt{5}}+\frac{3+\sqrt{3}}{\sqrt{3}}-\left(\sqrt{5}+\sqrt{3}\right)\)
\(D=\sqrt{\frac{4}{\left(2-\sqrt{5}\right)^2}}-\sqrt{\frac{4}{\left(2+\sqrt{5}\right)^2}}\) \(E=\frac{\sqrt{10}-\sqrt{2}}{\sqrt{5}-1}-\frac{2-\sqrt{2}}{\sqrt{2}-1}\)
Put the verbs in brackets into their correct tense or form
1The car ( rotate) ....ten times before it ( land ) ....on its roof
2 Jose (write)....a letter to his family when his pencil (break) ....
3You talk as though it (be)....a small thing to leave your country forever
4 I wish I( not ask) .....the fishmonger to open these oysters.
5 They had their house(whitewash).....before Tet holiday.
6The job(be)...much worse than I expected.If I (realise)...how awful it was going to be (not accept)......it.
7 You should consider( go).....for a picnic or(stay)....at home this weekend.
8 A story about a girl who( save ).....the lives of two little childen (publish).......in our magazine lately .
9 Don't phone me between 6 and 7,I (have ).....dinner
10 She felt that she (watch )....
Tam giác ABC vuông tại A có AB<AC, đường cao AH.Gọi I và K là hình chiếu của H trên AB,AC .
a) biết BH =2cm,CH=8cm
b) Biết sinB + 3cosC=1.Tính các tỉ số lượng giá của góc B
c) Chứng minh \(\frac{1}{HI^2}+\frac{1}{HC^2}=\frac{1}{HK^2}+\frac{1}{HB^2}\)
GIÚP MK PHẦN B VÀ C NHA, A MK LM R