Giúp em câu 10 vs câu 11 ạ

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Giúp em câu 10 vs câu 11 ạ

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Giúp em câu 10 vs câu 11 ạ
giup-em-cau-10-vs-cau-11-a

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Môn Toán Khánh Gia 4 years 2020-10-13T16:41:54+00:00 2020-10-13T16:41:54+00:00 1 Answers 93 views 0

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Captcha* Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )

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Nho · Answer 1 · 2020-10-13T16:43:30+00:00

Nho

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2020-10-13T16:43:30+00:00 October 13, 2020 at 4:43 pm

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Câu 10:

$f (0) + f (1) + f (2) = \frac{\sqrt{3.0 + 2}}{2.0 - 3} + \frac{\sqrt{3.1 + 2}}{2.1 - 3} + \frac{\sqrt{3.2 + 2}}{2.2 - 3} = \frac{5 \sqrt{2} - 3 \sqrt{5}}{3}$

$\to C$

Câu 11:

$y_{1} = f (x_{1}) = \frac{2.1 - 1}{{4.1}^{2} + 3.1 - 6} = 1$

$y_{2} = f (x_{2}) = \frac{- 2.2 - 1}{{4.2}^{2} - 2.3 - 6} = \frac{- 5}{4}$

$\Rightarrow y_{1} + y_{2} = \frac{- 1}{4}$

$\to B$

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