\(\sqrt{4x+20}+3\sqrt{x+5}-\sqrt{9x+45}=6\)
\(\Leftrightarrow\sqrt{4\left(x+5\right)}+3\sqrt{x+5}-\sqrt{9\left(x+5\right)}=6\)
\(\Leftrightarrow2\sqrt{x+5}+3\sqrt{x+5}-3\sqrt{x+5}=6\)
\(\Leftrightarrow2\sqrt{x+5}=6\)
\(\Leftrightarrow\sqrt{x+5}=3\)
\(\Leftrightarrow x+5=9\)
\(\Leftrightarrow x=4\)
\(\sqrt{4x+20}-3\sqrt{5+x}+\dfrac{4}{3}\sqrt{9x+45}=6\) tìm x
2.tìm x
a)\(\sqrt{x^2-6x+9}\)
b)\(\sqrt{x^2-2x+1}\)
c)\(\sqrt{4x+12}-3\sqrt{x+3}+7\sqrt{9x+27}=20\)
d)\(\sqrt{4x+20}+3\sqrt{\dfrac{x-5}{9}}-\dfrac{1}{3}\sqrt{9x-45}=6\)
d) \(x-5\sqrt{x}+6=0\)
e) \(\sqrt{x-1}+\dfrac{3}{2}\sqrt{4x-4}-\dfrac{2}{5}\sqrt{25x-25}=4\)
f) \(\sqrt{x-5}+\sqrt{4x-20}-\dfrac{1}{3}\sqrt{9x-45}=6\)
Câu 2: Tìm x biết:
a. \(\sqrt{x-1}=2\)
b. \(\sqrt{3x+1}=\sqrt{4x-3}\)
c. \(\sqrt{4x+20}-3\sqrt{5+x}+\dfrac{4}{3}\sqrt{9x+45}=6\)
d. \(\sqrt{x^2-4x+4}=\sqrt{6+2\sqrt{5}}\)
Câu1: √(25x2 - 9) = 2 √(5x - 3)
Câu2: √(4x - 20) + √(x - 5) - 1/3 × √(9x - 45) = 4
Câu3: √(x - 8) + √(4x - 20) - 1/5 × √(9x - 45) = 3
giải phương trinh
\(4\sqrt{x}-2\sqrt{9x}+16\sqrt{x}=5\)
\(\sqrt{4x+20}-3\sqrt{5+x}+\frac{4}{3}.\sqrt{9x+45}=6\)
a)\(\sqrt{4-5x}=12\) tìm x
b)\(\sqrt{10+\sqrt{3x}}=2+\sqrt{6}\)
c)\(\sqrt{4x+20}-3\sqrt{5+x}+\dfrac{4}{3}\sqrt{9x+45}=6\)
A= √4x+20- 2√x+5+ √9x+45 với x≥ -5 a, rút gọn A b, Tìm x để A = 6
a \(\sqrt{4x-20}+\sqrt{x-5}-\dfrac{1}{3}\sqrt{9x-45}=4\)
b \(\sqrt{x-1}+\sqrt{4x-4}-\sqrt{25x-25}=4\)
c \(\dfrac{1}{3}\sqrt{x-2}-\dfrac{2}{3}\sqrt{9x-18}+6\sqrt{\dfrac{x-2}{81}=-4}\)
d \(\sqrt{9x+27}+4\sqrt{x+3}-\dfrac{3}{4}\sqrt{16x+48}=0\)
