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MQ
0
18 tháng 2 2021
1) Vì x=25 thỏa mãn ĐKXĐ nên Thay x=25 vào biểu thức \(A=\dfrac{\sqrt{x}-2}{x+1}\), ta được:
\(A=\dfrac{\sqrt{25}-2}{25+1}=\dfrac{5-2}{25+1}=\dfrac{3}{26}\)
Vậy: Khi x=25 thì \(A=\dfrac{3}{26}\)
2) Ta có: \(B=\dfrac{\sqrt{x}-3}{\sqrt{x}+1}+\dfrac{2x+8\sqrt{x}-6}{x-\sqrt{x}-2}\)
\(=\dfrac{\left(\sqrt{x}-3\right)\left(\sqrt{x}-2\right)}{\left(\sqrt{x}-2\right)\left(\sqrt{x}+1\right)}+\dfrac{2x+8\sqrt{x}-6}{\left(\sqrt{x}-2\right)\left(\sqrt{x}+1\right)}\)
\(=\dfrac{x-5\sqrt{x}+6+2x+8\sqrt{x}-6}{\left(\sqrt{x}-2\right)\left(\sqrt{x}+1\right)}\)
\(=\dfrac{3x+3\sqrt{x}}{\left(\sqrt{x}-2\right)\left(\sqrt{x}+1\right)}\)
\(=\dfrac{3\sqrt{x}\left(\sqrt{x}+1\right)}{\left(\sqrt{x}-2\right)\left(\sqrt{x}+1\right)}\)
\(=\dfrac{3\sqrt{x}}{\sqrt{x}-2}\)
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Đỗ Thanh Hải
CTVVIP
10 tháng 7 2021
Có ngay
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7. I can't wait for The Rolling Stone's new album to ………come out …………………….. .
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10. She always ……………comes up with ……………….. new ideas for their advertising campaigns.
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13 tháng 5 2019
Câu hỏi của Khanh Tay Mon - Ngữ Văn lớp 8 - Học toán với OnlineMath
19 tháng 10 2021
- I usually get up at 7.30 a.m
- I sometimes have a big breakfast
- I often do my homework in the morning
- I always go to school by bike or on foot
- I sometimes watch tv after school
- I'm never on the sofa all day
-I often help with the housework
- I normally chat online after dinner
- I'm usually in bed before 10 p.m.