cho phương trình x2-2mx+4m-4=0. tìm m để phương trình có 2 nghiệm phân biệt x1,x2 thỏa mãn: x12+2mx2-8m+5=0
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31 tháng 3 2020
1, I don't people looking at me
-I don't being looked at
2 They expect he will win the election
-He is expected to win the election
3 They decided to give all the money to the poor
They are going to give all the money to the poor
4 He let me use his computer yesterday
-I was let to use his computer yesterday
5 It is said he is best student in his school
-He is said to be the best student in his school
chúc bạn học tốt
31 tháng 3 2020
1. The foreign visitor was really impressed by the _________ views in the moutainous areas of Vietnam. (BREATH)
=> Breath-taking
2. I wish I could join the tour to Korea. The tour is _________ to me. I need to save more money for it. (AFFORD)
=> affordable.
3. Old people prefer to buy _________ tours for their travel becuse everything is well-prepared by tracel agencies. (PACK)
=> package
4. This campaign is held by the local government as a __________ for ecotourism. (PROMOTE)
=> promotion
5. Old people tend to be interested in cultural tourism and __________ tourism more than any ther kinds. (RELIGION)
=> religious.
30 tháng 3 2020
\(ĐKXĐ:x\ge-1;2x+y\ne0\)
Ta có:\(\sqrt{x+1}-\frac{2}{2x+y}=-1\Rightarrow3\sqrt{x+1}-\frac{6}{2x+y}=-3\left(1\right)\)
\(\sqrt{4x+4}+\frac{3}{2x+y}=5\Rightarrow2\sqrt{4\left(x+1\right)}+\frac{6}{2x+y}=10\Rightarrow4\sqrt{x+1}+\frac{6}{2x+y}=10\left(2\right)\)
Lấy (1) cộng (2) ta được:
\(\Rightarrow4\sqrt{x+1}+3\sqrt{x+1}=7\Rightarrow7\sqrt{x+1}=7\Rightarrow\sqrt{x+1}=1\Rightarrow x+1=1\Rightarrow x=0\left(TM\right)\)
Khi đó ta có:\(\Rightarrow\sqrt{0+1}-\frac{2}{2.0+y}=-1\Rightarrow1-\frac{2}{y}=-1\Rightarrow\frac{2}{y}=2\Rightarrow y=1\)
Vậy \(x,y\in\left\{0;1\right\}\)