Giúp mình bài này với mình cảm ơn rất nhìuuuu.
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8 tháng 10 2021
\(=\left(4+\sqrt{15}\right)\left(\sqrt{5}-\sqrt{3}\right)\sqrt{2}\sqrt{4-\sqrt{15}}\\ =\left(4+\sqrt{15}\right)\left(\sqrt{5}-\sqrt{3}\right)\sqrt{8-2\sqrt{15}}\\ =\left(4+\sqrt{15}\right)\left(\sqrt{5}-\sqrt{3}\right)\sqrt{\left(\sqrt{5}-\sqrt{3}\right)^2}\\ =\left(4+\sqrt{15}\right)\left(\sqrt{5}-\sqrt{3}\right)\left(\sqrt{5}-\sqrt{3}\right)\\ =\left(4+\sqrt{15}\right)\left(8-2\sqrt{15}\right)\\ =32-8\sqrt{15}+8\sqrt{15}-30=2\)
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Ai giúp mình giải câu 3 với,mình cảm ơn nhìuuuu ạ 🥺
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15 tháng 9 2021
\(a,ĐKXĐ:\left\{{}\begin{matrix}8-4x\ge0\\5x-10\ne0\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x\le2\\x\ne2\end{matrix}\right.\Leftrightarrow x< 2\\ b,ĐKXĐ:\left\{{}\begin{matrix}\dfrac{-3}{x+2}\ge0\\x^2+2\ge0\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x+2< 0\left(-3< 0;x+2\ne0\right)\\x\in R\left(x^2+2\ge2>0\right)\end{matrix}\right.\Leftrightarrow x< -2\)
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Đỗ Thanh Hải
CTVVIP
19 tháng 10 2021
1 Nam said that he came from Thanh Hoa city
2 Mr Cuong asked me if I liked pop music
3 Although the weather was bad, we visited Bat Trang village
4 Because it was raining, they cancelled the trip to Trang An
5 We have to try harder so that our handicrafts can keep up with theirs
6 She grew up in Thanh Hoa city
II
1 Eventhough it was very cold out, we decided to go for a walk
2 Mai studied hard for the exam so that she could have good marks
MK
19 tháng 10 2021
1. nam said that he came from Thanh Hoa city.
2.Mr. Cuong asked if I liked pop music
3. although the weather was bad, we visited bat Trang village
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