\(P=\sqrt{\left(x+2\right)^2}+\sqrt{\left(2-x\right)^2}=\left|x+2\right|+\left|2-x\right|\)
\(\Rightarrow P\ge\left|x+2+2-x\right|=4\)
\(\Rightarrow P_{min}=4\) khi \(\left(x+2\right)\left(2-x\right)\ge0\Rightarrow-2\le x\le2\)
\(P=\sqrt{\left(x+2\right)^2}+\sqrt{\left(2-x\right)^2}=\left|x+2\right|+\left|2-x\right|\)
\(\Rightarrow P\ge\left|x+2+2-x\right|=4\)
\(\Rightarrow P_{min}=4\) khi \(\left(x+2\right)\left(2-x\right)\ge0\Rightarrow-2\le x\le2\)
tim gia tri nho nhat cua P=\(\frac{x+3\sqrt{x}+2}{x}\)
Cho bieu thuc \(\sqrt{9x+9}+\sqrt{4x+4}+\sqrt{x+1}\)voi x\(\ge\)-1.Tim x sao cho bieu thuc co gia tri bang 18
Giải phương trình
\(a.\dfrac{3}{4}\sqrt{4x}-\sqrt{4x}+5=\dfrac{1}{4}\sqrt{4x}\)
\(b.\sqrt{3-x}-\sqrt{27-9x}+1,25.\sqrt{48-16x}=6\)
\(c.\dfrac{5\sqrt{x}-2}{8\sqrt{x}+2,5}=\dfrac{2}{7}\)
\(d.\sqrt{9x^2+12x+4}=4\)
giải phương trình:
a) \(\sqrt{x-1}=\sqrt{3x-2}+\sqrt{5x-1}\)
b) \(\sqrt{4x+1}-\sqrt{3x+4}=1\)
c) \(\sqrt{x^2-4x+4}+\sqrt{x^2-6x+9}=1\)
Bài 1 GIẢI PHƯƠNG TRÌNH:
a) \(\sqrt{x-5}=\sqrt{3-x}\)
b) \(\sqrt{4-5x}=\sqrt{2-5x}\)
c) x2+4x+5=2\(\sqrt{2x+3}\)
d) \(\sqrt{x^2-2x+1}=\sqrt{4x^2-4x+1}\)
giải các phương trình sau:
\(\sqrt{x^2+6x+9}=3x-6\)
\(\sqrt{x^2-2x+1}=\sqrt{4x^2-4x+1}\)
\(\sqrt{4-5x}=2-5x\)
\(\sqrt{4-5x}=\sqrt{2-5x}\)
Cho biểu thức B= \(\sqrt{4x-2\sqrt{4x-1}}\)\(+\sqrt{4x+2\sqrt{4x-1}}\)\(với\dfrac{1}{4}\le x\le\dfrac{1}{2}\)
tìm x
1. 4x-\(\sqrt{9x^2+6x+1}\)=0
2. \(\sqrt{4x}+20-3\sqrt{5+x}+\dfrac{4}{3}\sqrt{9x+45}=0\)
3. \(\sqrt{x^2}+x+1=x+2\)
4. \(\sqrt{6x^2}+2-\sqrt{3x^2}=\sqrt{26}-\sqrt{13}\)
5. \(\dfrac{\sqrt{x}-2}{\sqrt{x}-4}=\dfrac{\sqrt{x}-6}{\sqrt{x}-7}\)
6. \(\sqrt{4x^2-4x+1}=3\)
giải từng bước ra cho mik nha,thank mn
Giải phương trình vô tỉ:
1) \(8x^2+\sqrt{\dfrac{1}{x}}=\dfrac{5}{2}\)
2) \(x^2+2x+4=3\sqrt{x^3+4x}\)
3) \(\sqrt{\dfrac{x^3}{3-4x}}-\dfrac{1}{2\sqrt{x}}=\sqrt{x}\)
4) \(\sqrt{\dfrac{5\sqrt{2}+7}{x+1}}+4x=3\sqrt{2}-1\)