1) ( \(3\sqrt{50}-5\sqrt{18}+3\sqrt{8}\) ).\(\sqrt{2}\)2. Tìm điều kiện:1)\(\sqrt{-10x}\) 6) \(\sqrt{\dfrac{3x+21}{-5}}\)2) \(\sqrt{6-3x}\) 7) \(\sqrt{\left(x^2+1\right).2x}\)3) \(\dfrac{-4}{\sqrt{4x+6}}\) 8) \(\sqrt{\left(-x^2-2\right)}.3x\)4) \(\dfrac{5}{\sqrt{2x}}\) 9) \(\sqrt{\dfrac{1}{\left(x-1\right)^2}}\)5) \(\sqrt{\dfrac{-1}{2x-6}}\)hộ mk với tí nx pk...
Đọc tiếp
1) ( \(3\sqrt{50}-5\sqrt{18}+3\sqrt{8}\) ).\(\sqrt{2}\)
2. Tìm điều kiện:
1)\(\sqrt{-10x}\) 6) \(\sqrt{\dfrac{3x+21}{-5}}\)
2) \(\sqrt{6-3x}\) 7) \(\sqrt{\left(x^2+1\right).2x}\)
3) \(\dfrac{-4}{\sqrt{4x+6}}\) 8) \(\sqrt{\left(-x^2-2\right)}.3x\)
4) \(\dfrac{5}{\sqrt{2x}}\) 9) \(\sqrt{\dfrac{1}{\left(x-1\right)^2}}\)
5) \(\sqrt{\dfrac{-1}{2x-6}}\)
hộ mk với tí nx pk nộp r ;-; help
Bài 1:
Ta có: \(\left(3\sqrt{50}-5\sqrt{18}+3\sqrt{8}\right)\cdot\sqrt{2}\)
\(=\left(15\sqrt{2}-15\sqrt{2}+6\sqrt{2}\right)\cdot\sqrt{2}\)
\(=6\sqrt{2}\cdot\sqrt{2}\)
=12
Bài 2:
1) ĐKXĐ: \(x\le0\)
2) ĐKXĐ: \(x\le2\)
3) ĐKXĐ: \(x>\dfrac{-3}{2}\)
4) ĐKXĐ: x>0
5) ĐKXĐ: x<3