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$\frac{1}{x}$ + $\frac{1}{x+\frac{3}{2} }$ = $\frac{5}{9}$

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Avi Anh

5 tháng trước

Giải thích các bước giải:

`1/x + 1/(x+3/2) =5/9` `(ĐK: x \ne 0; x \ne -3/2)`

`<=>1/x +1/((2x+3)/2) =5/9`

`<=>1/x + 1: (2x+3)/2 =5/9`

`<=>1/x +2/(2x+3) =5/9`

`<=>1/x +2/(2x+3) -5/9 =0`

`<=>(9(2x+3))/(9x(2x+3))+(9x.2)/(9x(2x+3))-(5x(2x+3))/(9x(2x+3))=0`

`<=>9(2x+3)+(9x.2)-[5x(2x+3)]=0`

`<=>18x+27+18x-10x^2 -15x=0`

`<=>10x^2 -21x-27=0`

`<=>10x^2 +9x-30x-27=0`

`<=>x(10x+9)-3(10x+9)=0`

`<=>(x-3)(10x+9)=0`

`<=>`$\left[ \begin{array}{l}x-3=0\\10x+9=0\end{array} \right.$

`<=>`$\left[ \begin{array}{l}x=3\\x=-\dfrac{9}{10}\end{array} \right.$ `(tmđk)`

Vậy phương trình có tập nghiệm: `S={-9/10 ;3}`

Nhật Minh Đinh

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$\frac{1}{x}$ + $\frac{1}{x+\frac{3}{2} }$ = $\frac{5}{9}$

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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$\frac{1}{x}$ + $\frac{1}{x+\frac{3}{2} }$ = $\frac{5}{9}$

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.