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1. Our sources of energy will soon end if we don't try to save them
Unless.we try to save our sources of energy, they will soon end ................................................................................................
2. Barbare plays chess better than Mike
Mike doesn't ....play chess as well as Barbare ....................................................................................
3. We will probably visit Japan in the future.
We might ...visit Japan in the future.............................................................................................
4. My brother can run very fast
My brother is....a fast runner.......................................................................................
5 . Uless we protect the envirronment,we will destroy ourselves
If ....we don't protect the environment,we will destroy ourselves........................................................................................................
6. Uless she is more hard working , she will get low marks
If ....she isn't more hard working , she will get low marks...........................................................................................................
7. Uless he listens to his parents,he will fail
If ...he doesn't listen to his parents,he will fail.............................................................................................................
8. They began watching the movie one hour ago
They have .watched the movie for one hour................................................................................................
9 . He last cried ten years ago
He has.....never cried for ten years.....................................................................................................
I'm thư worst in my class
Mark doesn't do homework in the evening
We don't play football after school
You run really slow
Tim and Locus don't work at weekend
I don't classical music
The excicise are not difficult
She doesn't have Science on Friday
hoc tốt
1. I'm the worst in the class.
2.Mark doesn't do homework.
3.We don't play football after school.
4.You run slow.
5.Tim and Locus doesn't work at weekends.
6.I don't classical music.
7.These exercises are easy.
8.She doesn't have science on Friday.
Có: A+B = a + b - 5 - b - c + 1 = a - c - 4
C - D = b - c - 4 - b + a = a - c - 4
=> A + B = C - C ( = a - c -4)
A + B = a + b - 5 + ( - b - c + 1)= a + b - 5 - b - c + 1 = a - c - 4 (1)
C - D = b - c - 4 - (b - a) = b - c - 4 - b + a = - c - 4 + a = a - c - 4 (2)
(1) và (2) => A + B = C - D
b) Biểu thức ( - a - b + c ) - ( - a - b - c )
= [ - 1 - ( -1 ) + ( - 2 ) ] - [ - 1 - ( - 1 ) - ( - 2 ) ]
= - 1 + 1 - 2 + 1 - 1 - 2
= ( - 1 + 1 ) + ( 1 - 1 ) + ( - 2 - 2 )
= 0 + 0 + ( - 4 )
= - 4
Tick nha
b.
(−23)+13(−17)+57(−23)+13(−17)+57
=(−23)+(−221)+57=(−23)+(−221)+57
=−23−221+57=−23−221+57
=−(23+221)+57=−(23+221)+57
=−244+57=−244+57
=−(244−57)=−(244−57)
=−187
c) 14+6+(−9)+(−14)14+6+(−9)+(−14)
=14+6−9−14=14+6−9−14
=20−9−14=20−9−14
=11−14=11−14
=−3
d) (−123)+|13|+(−7)(−123)+|13|+(−7)
=−123+13−7=−123+13−7
=−(123−13)−7=−(123−13)−7
=−110−7=−110−7
=−(110+7)=−(110+7)
=−117
Mình chỉ làm được 3 câu thôi !
Mình xin lỗi
S=-a+b+c-c+b+a-a-b
S=-a+b=b-a
nên /S/=/b-a/
mà a> b suy ra /S/=a-b
tick mik nhé đúng đấy
a) 8180 < 2790
b) 377 > 738
c) 536 < 1124
d) 291 < 535
Đúng thì k, sai thì thôi
D/ listen to
D/ listen to
( Đúng 100% )
k mik nha, mik đầu tiên