còn mấy bài nx nè hjhj mong các bạn giúp tớ hoàn thành đề cương! cảm ơn các bạn nhìu nhá! mình sẽ tích hết cho nhưng bạn trả lời đầy đủ ạ!!!
Exercise 5: Choose the best option to complete each sentence. Circle A, B or C.
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xy -1 = 3x+5y+4
<=> xy -3x-5y=5
<=>xy-3x-5y+15=20
<=>x(y-3)-5(y-3)=20
<=> (x-5)(y-3) =20
Vì x,y E Z và (x-5)(y-3)=20
=> (x-5),(y-3) E Ư(20)={+1;+2;+4;+5;+10;+20}
Ta có bảng sau
x-5 -20 -10 -5 -4 -2 -1 1 2 4 5 10 20
y-3 -1 -2 -4 -5 -10 -20 20 10 5 4 2 1
x -15 -5 0 1 3 4 6 7 9 10 15 25
y 2 1 -1 -2 -7 -17 23 13 8 7 5 4
Do x,y E Z => (x;y) E { (-15;2);(-5;1);(0;-1);(1;-2);(3;-7);(4;-17);(6;23);(7;13);(9;8);(10;7);(15;5);(25;4)} (thỏa mãn)
KL:...
Bạn toán chạy nhanh hơn bạn văn số thời gian là :
6 phút 13 giây - 5 phút 56 giây = 17 giây
Đáp số : 17 giây
k đúng cho mik nhe
(oh) hóa trị 1 mà zn hóa trị 2=> cthh la zn(oh)2
với lại ko có oh2 dau chi co OH hoac la H2O
1.
The room ____________ to store old furniture.
A. used
B. was used
C. used to be
2.
You will need ____________ an umbrella because it rains a lot there.
A. to bring
B. bring
C. bringing
3.
The dog ____________ by a truck.
A. ran over
B. was ran over
C. was run over
4.
I ____________ with Ms. Adamson in Grade 6.
A. was studied
B. was taught
C. studied
5.
You ____________ your money in your pocket.
A. had better not put
B. hadn't better put
C. had better not to put
1.
The room ____________ to store old furniture.
A. used
B. was used
C. used to be
2.
You will need ____________ an umbrella because it rains a lot there.
A. to bring
B. bring
C. bringing
3.
The dog ____________ by a truck.
A. ran over
B. was ran over
C. was run over
4.
I ____________ with Ms. Adamson in Grade 6.
A. was studied
B. was taught
C. studied
5.
You ____________ your money in your pocket.
A. had better not put
B. hadn't better put
C. had better not to put