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$\displaystyle \begin{cases} x+y+z=1 & \\ xy+yz+xz=xyz & \end{cases}$

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Đáp án:

$ x+y+z=1$

$xy+yz+xz=xyz$

$y(x+z)+xz(1-y)=0$

$y(1-y)+xz(1-y)=0$

$<=>(1-y)(y+xz)=0$

$TH1<=>y=1=>x+z=0=>x=-z$

$TH2 :y=-x.z$

$x+z-xz-1=0$

$z(1-x)-(1-x)=0$

$<=>(1-z)(1-x)=0$

$=>z=1=>y=-x $

$hoặc$$ x=1=>y=-z$

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$\displaystyle \begin{cases} x+y+z=1 & \\ xy+yz+xz=xyz & \end{cases}$

1 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.

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$\displaystyle \begin{cases} x+y+z=1 & \\ xy+yz+xz=xyz & \end{cases}$

1 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.