Nguyễn Hồng Sơn

6 tháng trước

4x^2 + 7x + 3 = 0 giúppp

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Thegod2k7

6 tháng trước

$\textit{Đáp án + Giải thích các bước giải:}$

`4x^2+7x+3=0`

`Δ=b^2-4ac=7^2-4.4.3=1>0`

phương trình có hai nghiệm phân biệt

`x_1=(-b+\sqrt{Δ})/(2a)=(-7+\sqrt{1})/(2.4)=-3/4`

`x_2=(-b-\sqrt{Δ})/(2a)=(-7-\sqrt{1})/(2.4)=-1`

Vậy `S={-3/4;-1}`

pchi0802

6 tháng trước

Đáp án + Giải thích các bước giải:

`4x^2+7x+3=0`

`⇔4x^2+4x+3x+3=0`

`⇔ (4x^2+4x)+(3x+3)=0`

`⇔ 4x(x+1)+3(x+1)=0`

`⇔ (x+1)(4x+3)=0`

`⇔`$\left[\begin{matrix} x+1=0\\ 4x+3=0\end{matrix}\right.$

`⇔` $\left[\begin{matrix} x=-1\\ x=\dfrac{-3}{4}\end{matrix}\right.$

Vậy phương trình tập nghiệm `S={-1;(-3)/4}`

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4x^2 + 7x + 3 = 0 giúppp

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.

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4x^2 + 7x + 3 = 0 giúppp

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.