HOC24
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VII. tìm và chữa lỗi sai
1. She rarely goes to the cinema at weekend, isn’t she?
A B C D
2. She will pay less but she uses to energy- saving bulbs.
3. She walked ten kilometers a day to get water enough for her family to use.
4. I have already cleaned the floor, but I still need dusting the furniture.
5. I knew Tim when he was a child, but I didn’t see him for many years.
6. A tourist wanted to know whether she take any photos there
7.They worked in the garden when it started to rain.
8. Thanks for invite me to your birthday party.
A B D D
9. You have never been to Ho Chi Minh City before, haven’t you?
10. He is not old enough driving motorbike.
1. Please don't make so much noise... I’m... trying... (I / try) to work.
2. Let's go out now .....It isn’t raning.. (it / rain) any more.
3. You can turn off t he radio........I'm not listening...............(I / listen) to it.
4. Kate phoned me last night. She's on holiday in France. ...She is having.............(she / have) a great t ime and doesn't want to come back.
5. I want to lose weight, so t his week ....I'm not eating......... . . ....... .......... .. ..... (I / eat) lunch.
6. Andrew has just started evening classes. .. .............He is learning..... ........ . .. (he / learn) Japanese
7. Paul and Sally have had an argument. .. .................... ..They are speaking... .... . ........ (they / speak) to each other.
8. ..........I am getting.. .... (I /get) tired. I need a rest.
9. Tim ....... . .. .........isn't working......... (work) today. He's taken the day off.
10. .... .I am looking . (I / look) for Sophie. Do you know where she is?
1+1=2
1.Selina lives.....in............a village in Africa.Her day starts......at..........4o'clock.She gets up and she walks three kilometers...to.........the river.She collects some water,and she carries it back....to..........her house.The water is very heavy.It isn't clean but there isn't any water in the village.Selina doesn't go....to.........school because there is not school for the children.
2Mrs Chi and her children......are.............working in the garden .She has a very beautiful garden behind her house .There are....a...........lot of flowers in the garden .She usually puts......some.......flowers in the sitting room.Mrs Chi has.......a.........friend...............in......LonDon.Her friends are .......going..............to visit her familly next week .Mrs Chi often gives them a .........lot of..............flowers when they go home from her house.
*nA= \(\dfrac{m_A}{M_A}\) => 0.2=\(\dfrac{4.8}{M_A}\)
<=> MA= 24
Vậy kim loại A là Magie(Mg)
*nFe = \(\dfrac{m_Fe}{M_Fe}\) => nFe =\(\dfrac{11,2}{56}\)
<=>nFe= 0,2
nB = \(\dfrac{m_B}{M_B}\) => 0,32-0,2= \(\dfrac{3,24}{M_B}\)
<=> MB=27
Vậy kim loại B là nhôm (Al)
I'm the younger person in my familly
-younger -> youngest
My brother is busyyer tham i am
busyyer tham -> busier than
Mary is taller that her sister
that-> than
Zhang is from China.She speak Chinan
speak Chinan -> speaks Chinese
LonDon is smallest than Mexico city
smallest-> smaller
She's my friend.She's from French
French-> France
Is your kitchen bigger than my kitchen?
my kitchen-> mine
How height is the Petronas Twin Towers?
height -> tall
Which season is coldest in your country?
coldest-> the coldest
My brother is so generous that he willingly lends people money.
6.D 7.B
I.1.C 2B 3B 4D 5D 6B 7B 8C 9C 10D 11D 12C
a/ A=(4-5x)2 - (3+5x)2
= (4-5x-3-5x).(4-5x+3+5x)
= -10x . 7
= -70x
Vậy A=-70X
b/ B= (3x-1)(1+3x)-(3x+1)2
= 9x2-1- 9x2+6x+1
= 6x
Vậy B=6x
c/ C=(2x+5)3-(2x-5)3-(120x2+49)
= (2x+5-2x+5)[(2x+5)2+(2x+5)(2x-5)+(2x-5)2 ]-(120x2+49)
= 10.(4x2+20x+25+4x2+10x-10x-25+4x2-10x+25)-(120x2+49)
= 10.(12x2+10x+25)-(120x2+49)
=120x2+100x+250-120x2-49
= 100x+201
d/ D=(2a-b+2)3-6(2a-b+2)2+12(2a-b+2) -8- (2a-b)3
= (2a-b+2)[(2a-b+2)2-6(2a-b+2)+12]-( 2+2a-b).[4-2(2a-b)+(2a-b)2 ]
= (2a-b+2)(4a2-4ab+b2+8a-4b+4-12a+6b-12+12)-(2a-b+2)(4-4a+2b+4a2-4ab+b2)
= (2a-b+2)(4a2-4ab+b2-4a+2b+4-4+4a-2b-4a2+4ab-b2)
= (2a-b+2).0
=0