Đáp án: Giải hệ phương trình x-2y=-8 7x+2y=-8 - Đáp án Giải thích các bước giải

ghenjsM2g

5 tháng trước

Giải hệ phương trình x-2y=-8 7x+2y=-8

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Van Hao

5 tháng trước

Đáp án:

Giải thích các bước giải:

Hikivision2006

5 tháng trước

Đáp án + Giải thích các bước giải:

`{(x-2y=-8),(7x+2y=-8):}`

`⇔{(8x=-16),(7x+2y=-8):}`

`⇔{(x=-2),(7x+2y=-8):}`

`⇔{(x=-2),(7.(-2)+2y=-8):}`

`⇔{(x=-2),(-14+2y=-8):}`

`⇔{(x=-2),(2y=6):}`

`⇔{(x=-2),(y=3):}`

Vậy hệ phương trình có nghiệm duy nhất là `(-2;3)`

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Giải hệ phương trình x-2y=-8 7x+2y=-8

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.

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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.

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Giải hệ phương trình x-2y=-8 7x+2y=-8

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.