Bài 1:Thực hiện phép tính

1. \(\sqrt{27}-3\sqrt{48}-2\sqrt{75}-\sqrt{\left(2-\sqrt{3}\right)^2}\)

2.\(\left(\sqrt{8}-5\sqrt{2}+\sqrt{20}\right).\sqrt{5}+\left(40\sqrt{\frac{1}{10}}-10\right)\)

3.\(\left(\sqrt{24}-\sqrt{\frac{2}{3}}-\sqrt{\frac{1}{6}}+\sqrt{\frac{3}{2}}\right).\sqrt{6}\)

Bài 1:Tìm x biết

1.\(\frac{2}{3}\sqrt{12x}+\sqrt{12x}-9=\frac{1}{3}\sqrt{3x}\)

2.\(\sqrt{2x}-3\sqrt{8x}+4\sqrt{18x}=14\)

Bài 2:Giải phương trình

a,\(\sqrt{8x-4}-2\sqrt{18x-9}+2\sqrt{32x-16}=12\)

b.\(\sqrt{x^2-6x+9}=2x-1\)

Bài 2:Tìm điều kiện của x để căn thức sau có nghĩa:

a.\(\sqrt{5x+2}\)

b.\(\sqrt{\frac{-3}{2x+1}}\)

Xem lại đề.

Bài 1:Thực hiện phép tính

1.(\(\sqrt{28}_{ }-\sqrt{12}-\sqrt{7}\))\(\sqrt{7}\)+2\(\sqrt{21}\)

2. 2\(\sqrt{3}\) +\(\sqrt{27}\)-3\(\sqrt{45}\) +\(\sqrt{5}\)

3.(2\(\sqrt{2}\) -\(\sqrt{5}\)+\(\sqrt{18}\)).\(\sqrt{5}+20\sqrt{\frac{1}{10}}\)

4.\(\sqrt{27}-3\sqrt{48}+2\sqrt{75}-\sqrt{\left(2-\sqrt{3}\right)^2}\)

5.(\(\sqrt{8}-5\sqrt{2}+\sqrt{20}\)).\(\sqrt{5}\)+(40\(\sqrt{\frac{1}{10}}-10\)

6. \(\sqrt{2x}-3\sqrt{8x}+4\sqrt{18x}=14\)

Question 1: Anybody who........................my questions will be given a reward

A.answered B.answering C.are answer D.answers

Question 2:Don't make noise because our children................English in their room

A.are learning B.learns C.learned D.is learning

Question 3:Let eat dinner together,................?

A.will you B.would you C.shall we D.do you

Questions 4:Scientists are seeking the best ways to deal with the...............impact of pollution

A.environment B.environmental C.environments D.environmentally

Question 5:The villagers are trying their best to improve their English..........communicate with foreign customers

A.so that B.in order that C.so as to D.in order not to

Questions 6:I lived in Da Nang,......................is one of the most beautiful cities of Viet Nam

A.who B.whom C.which D.whose

Questions 7:The novel you have already bought is twice.................that I bought yesterday

A.more expensive than B.much expensive as C.as expensive as D.as expensive than

Questions 8:A traditional craft fair is going to...............to raise money for the victims of the flood

A.organising B.organise C.organised D.be organised

Question 9:Peter:"How much bread have you got"?

Mary:'",.................................................."

A.There is on here for her B.there is a lot in the kitchen C.There aren't any left D.It costs S5

Question 10:Smith:"Please clean the kitchen when you finish."

Kate:'.................................................................."

a.Don't worry,I will B.Sorry,I haven't got any C.Yes,here you are D.That's great

Question 1:Neither Hoa nor her classmates................ to Dong Ho folk painting so far

A.visit B.visted C.have visited D.has visited

Question 2.Lan speak English flurntly and so..........................

A.do her friends B.her friends are C.her friends do D.are her friends

Question 3:My mother doesn't know...........start the engine

A.how B.how to C.what D.what to

Questions 4:My grandfather, .................has been retired for ten years now,used to be an English teacher

A.who B.which C.that D.whom

Questions 5:My family had a....................tour in Da Nang last month

A.seven day B.seven day times C.seven-days D.seven-day

Questions 6:These dresses are different..............the ones you bought yesterday

A.from B.with C.at D.about

Question 7:Peter:''Would you like some coffee"?

Mary:"..............................................."

A.I agree B.Yes,please C.Yes,I do D.Yes,I could

Questions 8:Smith:" I' ll make some sandwhich for lunch"

Kate:"......................................................"

A.Is there some for you B.Would you like some help? C.What is it made of? D.It is delicious

Bài tập:Cho 2,24 lít (đktc)tác dụng với dung dịch Ba(OH)\(_2\)dư.Tính khối lượng chất kết tạo thành