Đáp án: giải hệ phuong trình ( ((10x-9y=1) (15x+21y=36)) - 0w0

10x - 9y = 1 15x + 21y = 36 ⇔ 70x - 63y = 7 45x + 63y = 108 ⇔ 115x = 115 15x + 21y = 36 ⇔ x = 1 15 + 21y = 36 ⇔ x = 1 21y = 21 ⇔ x = 1 y = 1 Vậy ( x ; y ) = ( 1 ; 1 )

nhihoang626

4 tháng trước

giải hệ phuong trình $\left \{ {{10x-9y=1} \atop {15x+21y=36}} \right.$

Xem đáp án

16 lượt xem

2 câu trả lời

dinhhaidang2007

4 tháng trước

0w0

dungsenpai247

4 tháng trước

$\begin{cases} 10x - 9y = 1 \\ 15x + 21y = 36 \\ \end{cases}$

⇔ $\begin{cases} 70x - 63y = 7 \\ 45x + 63y = 108 \\ \end{cases}$

⇔ $\begin{cases} 115x = 115\\ 15x + 21y = 36 \\ \end{cases}$

⇔ $\begin{cases} x = 1 \\ 15 + 21y = 36 \\ \end{cases}$

⇔ $\begin{cases} x = 1 \\ 21y = 21 \\ \end{cases}$

⇔ $\begin{cases} x = 1 \\ y = 1 \\ \end{cases}$

Vậy ` ( x ; y ) = ( 1 ; 1 ) `

Đăng nhập để trả lời

Câu hỏi trong lớp Xem thêm

Viết một đoạn văn hoàn chỉnh về lý do học tiếng Anh bằng cách đưa ra các manh mối ( ko chép mạng nhá)

3 lượt xem

2 đáp án

9 giờ trước

31- Although I am poor, I always help the poor In spite of______________________ 32- In spite of the bad weather , the pilot will bring the plane down safely Although_ 33- although the team played well, they lost Despite____ 34- In spite of his good salary, he was unhappy in his job In spite of_ 35- in spite of his broken leg, he managed to get out of the car Although_ 26- Athough she is poor, she always helps the poor Much as_ 27- Although he was hard, she didn’t pass the exam Much as_ 28- Although he was rich, he didn’t help the poor No matter how 29- Although Peter is late, he could see the first film No matter_ 30. Although he isn’t rich. He isn’t happy. No matter_ 31. Although It was cold, he didn’t wear warm cloth No matter_ 32. Although his life was hard. He is determined to study well. Hard ______________________________ kết thúc ;-;

3 lượt xem

1 đáp án

9 giờ trước

21- in spite of his age, Mr Benson runs 8 miles before breakfast Although_______________________ 22- Although she said that she would cme, I don’t think she ever will Despite 23- Although we live in the same street, we don’t know each other Although 24- In spite of having little money, they are happy Although 25- In spite of the silly story, I enjoyed the film Although 26- Although Carol had a headache, she still read until late In spite of 27- Despite the bad weather, the trip was enjoyable Although_ 28- Despite being poor, she lives in happiness Even though 29- Despite not having the qualifications, Jane got the job Although_ 30- Although she was ill, she went to work Despite________________________

3 lượt xem

2 đáp án

9 giờ trước

việt nam dành độc lập vào năm nào

3 lượt xem

2 đáp án

9 giờ trước

Choose the best answer.
I think you should buy ___ pack of mineral water instead. And you can also buy _ snacks such as potato crisps, 3 kilos of mandarins, 2 kilos of apples, 3 bunches of bananas, ____ cookies and soft candies.

351

351 lượt xem

1 đáp án

1 năm trước

Choose the best answer.
We should decorate our living room with _ orange banner. We also need ____ ribbons, balloons, party hats and costume.

271

271 lượt xem

1 đáp án

1 năm trước

Choose the best answer.
I think that ______ cauliflower is not enough for 3 people. Let’s buy one more.

257

257 lượt xem

1 đáp án

1 năm trước

giải hệ phuong trình $\left \{ {{10x-9y=1} \atop {15x+21y=36}} \right.$

2 câu trả lời

Viết một đoạn văn hoàn chỉnh về lý do học tiếng Anh bằng cách đưa ra các manh mối ( ko chép mạng nhá)

việt nam dành độc lập vào năm nào

Choose the best answer.
I think you should buy ___ pack of mineral water instead. And you can also buy _ snacks such as potato crisps, 3 kilos of mandarins, 2 kilos of apples, 3 bunches of bananas, ____ cookies and soft candies.

Choose the best answer.
We should decorate our living room with _ orange banner. We also need ____ ribbons, balloons, party hats and costume.

Choose the best answer.
I think that ______ cauliflower is not enough for 3 people. Let’s buy one more.

Đề thi - đề kiểm tra Xem thêm

Chúng tôi

Học tốt

Liên kết

Mạng xã hội

giải hệ phuong trình $\left \{ {{10x-9y=1} \atop {15x+21y=36}} \right.$

2 câu trả lời

Viết một đoạn văn hoàn chỉnh về lý do học tiếng Anh bằng cách đưa ra các manh mối ( ko chép mạng nhá)

việt nam dành độc lập vào năm nào

Choose the best answer.I think you should buy _____ pack of mineral water instead. And you can also buy _____ snacks such as potato crisps, 3 kilos of mandarins, 2 kilos of apples, 3 bunches of bananas, ______ cookies and soft candies.

Choose the best answer.We should decorate our living room with _____ orange banner. We also need ________ ribbons, balloons, party hats and costume.

Choose the best answer.I think that ______ cauliflower is not enough for 3 people. Let’s buy one more.

Đề thi - đề kiểm tra Xem thêm

Choose the best answer.
I think you should buy ___ pack of mineral water instead. And you can also buy _ snacks such as potato crisps, 3 kilos of mandarins, 2 kilos of apples, 3 bunches of bananas, ____ cookies and soft candies.

Choose the best answer.
We should decorate our living room with _ orange banner. We also need ____ ribbons, balloons, party hats and costume.

Choose the best answer.
I think that ______ cauliflower is not enough for 3 people. Let’s buy one more.