thuyenkimiuduc

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rút gọn biểu thức căn bậc 2 x+ 11=3

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Phuong Vy

6 tháng trước

Đáp án:✓2x+11=3

2x+11=3^2

2x+11=9

2x=9-11

2x=-2

x=-1

ĐKXD:2x+11 lớn hơn hoặc bằng 0

x> hoặc bằng -11/2

Giải thích các bước giải:

nhatkt2007

6 tháng trước

$\sqrt{2x + 11}$ `=3`

`⇔ 2x +11 = 9`

`⇔ 2x = 9 - 11`

`⇔ 2x=-2`

`⇔ x = -2 : 2`

`⇔ x = -1`

ĐKXĐ: `2x + 11 >= 0`

`⇔ 2x >= -11`

`⇔ x >= {-11}/2`

`⇒ x= -1` thỏa mãn điều kiện xác định

Vậy `x=-1`

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rút gọn biểu thức căn bậc 2 x+ 11=3

2 câu trả lời

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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.

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