Stress. Câu1:A.disappear. B.engineer. C.education. D.attachment. Cau2:A.consume. B.reflect. C.local. D.between. Cau3:A.curtain. B.enclose. C.contain. D.remember. Cau4:A.distance. B.glorious. C.exciting. D.journey. Cau5:A.tremendous. B.enormous. C.serious. D.describe. Choose the best answers. Cau6:If I had enough money,I abroad to improve my english. A.If. B.would go. C.went. D.should have go to. Cau7:the bench would collapse If they on it. A.stood. B.stand. C.standing. D.stands. Cau8:If it covenient, let's go out for a drink tonight. A.be. B.is. C.was. D.were. Cau9:If I ,I wouldn't have left him there by himself. A.had been you. B.were you. C.am in your shoe. D.am in you place. Cau10:you are supposed to lock all the doors before . A.you are leaving. B.you leave. C.you will leave. D.you have left. Cau11: high school,Joe attended a nuiversity in the city centre. A.he was finiahed. B.having finished. C.Afer finished. D.having been finished. Cau12:everyone when there was a sudden explosion. A.were horrified. B.was horrifying. C.were horrifying. D.was horrified. Cau13:he arrived with a friend waited outside in the car. A.who. B.what. C.which. D.whose. Cau14:the man mobile was ringing did not know what to do. A.whom. B.who. C.whose. D.that. Cau15:the car the robbers escaped in was a BMW. A.it. B.which. C.whom. D.whose. Cau16:the woman daughter was crying tried to calm her down. A.she . B.who. C.that. D.whose.
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cau1 :120-(100+x)=25
100+x=120-25
100+x=95
x=-5
cau2: 5(x+23)+6=96
5(x+23)+6=96
5(x+23)=90
x+23=18
x=-5
cau3: 100-(25+x)=40
25+x=100-40
25+x=60
x=35
cau4: 35-9(x+2)=45
9(x+2)=-10
x+2=-10/9
x=-28/9
Câu 1 : ( 5x - 17 )3 = 27
( 5x - 17 )3 = 33
=> 5x - 17 = 3
5x = 3 + 17
5x = 20
x = 20 : 5
x = 4
Câu1:we are looking for place to spend night. A.the/the. B.a/the. C.a/a. D.the/a. Cau2:I was given beautiful bag on my birthday by my mother. A.a. B.an. C.the. D . No article. Cau3:Jack's father bought him bicycle that he had wanted for his birthday. A.a. B.an. C.the. D.no aryicle. Cau4:I am studying English and math this term. A.no article/the. B.the/the. C.the/no article. D.no article/no article. Cau5:On table for tea there were biscuits and sandwiches A.the. B.a. C.an. D.ho article . Cau6:I saw boy on the street last night. A.a. B.an. C.the. D.no article. Cau7:there is umbrella at corner of the house A.a/a. B.a/no article. C.an/the. D.an/no article. Cau8:normally,it takes us hour and half to go there A.a/a. B.an/a. C.a/an. D.a/no article. Cau9:we are going to hold home party on Chirstmas Day. A.an. B.a. C.the. D.no article. Cau10:if people paid more attention to the environment,the Earth greener. A.would be. B.will be. C.would have been. D.had been. Cau11:we decided at home this afternoon. A.staying. B.stayed. C.stay. D.to stay. Cau12:there was piano in the corner of the room. A.a. B.an. C.no article. D.the. Cau13:Tom made a serious mistake at work,but his boss didn't fire him.He's lucky a second chance. A.having given. B.having been given. C.to have given. D.to have been given Cau14:By the time their baby arrives,the johnsons hope painting and decorating the new nursery . A.having finished. B.having been finished. C.to have finished. D.to have been finished. Cau15:the new student hope in many of the school's social activities. A.including. B.being included. C.to include. D.to be included. Cau16:the owner of the building's supply store doesn't mind his customers discounts when they buy in large quantities. A.giving. B.being given. C.to opent. D.to be opened.
câu 1: 3,2
câu 2: 40
câu 3: 12
câu 4: 42
nhớ cho mình nhé !
Câu 1:
=>n(n+1)=1275
=>n^2+n-1275=0
=>\(n\in\varnothing\)
Câu 2:
a: Gọi d=ƯCLN(2n+1;3n+1)
=>6n+3-6n-2 chia hết cho d
=>1 chia hết cho d
=>d=1
=>ƯC(2n+1;3n+1)={1;-1}
b: Gọi d=ƯCLN(7n+10;5n+7)
=>35n+50-35n-49 chia hết cho d
=>1 chia hết cho d
=>d=1
=>7n+10 và 5n+7 là hai số nguyên tố cùng nhau
câu 1: 2134 + 6666 - 6666
= 2134 + 0
= 2134
câu 2: 2345 + 345 + 45 + 5
= 2690 + 50
= 1740
câu 3: 2543 + 54 + 43
= 2597 + 43
= 2640
1. Mickey . Jerry...............
2. DDorremon . tom ,......
3, Biết chết liền