\(=\sqrt{x}\left(3\sqrt{2}-5\sqrt{8}+7\sqrt{18}\right)+28\\ =\sqrt{x}\left(3\sqrt{2}-10\sqrt{2}+21\sqrt{2}\right)+28\\ =\sqrt{x}\cdot14\sqrt{2}+28=14\sqrt{2}\left(\sqrt{x}+\sqrt{2}\right)\)
\(=\sqrt{x}\left(3\sqrt{2}-5\sqrt{8}+7\sqrt{18}\right)+28\\ =\sqrt{x}\left(3\sqrt{2}-10\sqrt{2}+21\sqrt{2}\right)+28\\ =\sqrt{x}\cdot14\sqrt{2}+28=14\sqrt{2}\left(\sqrt{x}+\sqrt{2}\right)\)
Rút gọn các biểu thức sau:
a) \(A=3\sqrt{2x}-5\sqrt{8x}+7\sqrt{18x}+30\), \(x\ge0\)
b) \(B=4\sqrt{\dfrac{25x}{4}}-\dfrac{8}{3}\sqrt{\dfrac{9x}{4}}-\dfrac{4}{3x}\sqrt{\dfrac{9x^3}{64}}\), \(x>0\)
c) \(C=\dfrac{y}{2}+\dfrac{3}{4}\sqrt{1+9y^2-6y}-\dfrac{3}{2}\), \(y\le\dfrac{1}{3}\)
Giải phương trình:
\(\sqrt{18x+9}-\sqrt{8x+4}+\dfrac{1}{3}\sqrt{2x+1}=4\)
rút gọn
\(\left(\sqrt{28}-2\sqrt{14}+\sqrt{7}\right).\sqrt{7}+7\sqrt{8}\)
giúp mink vs ạ
Giải phương trình:
a) \(\sqrt{4x^2+20x+25}+\sqrt{x^2-8x+16}=\sqrt{x^2+18x+81}\)
b) \(2x^2-8x-3\sqrt{x^2-4x-5}=12\)
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A= x-2 2+ sqrt x (x>=0); ==( 8x sqrt x -1 2x- sqrt x - 8x sqrt x +1 2x+ sqrt x )= 2x+1 2x-1 vdi x>0,x ne 1 2 ;x ne- 1 2 MS05. Cho A =- a. Rút gọn B. b. Tim x d hat e A B =1
Tìm x
a, \(\sqrt{x^2-4x+4}-2x+5=0\)
b,\(\sqrt{x^2+6x+9}=x+3\)
c, \(\frac{1}{3}\sqrt{2x}-\sqrt{8x}+\sqrt{18x}-10=2\)
Giải các phương trình sau:
a.\(3\sqrt{18x}-5\sqrt{8x}+4\sqrt{50x}=38\)
b.\(3\sqrt{12x}-2\sqrt{27x}+4\sqrt{3x}=8\)
c.\(\sqrt{4x-20}+\sqrt{x-5}-\dfrac{1}{3}\sqrt{9x-45}=4\)
Tìm x biết:
a.\(\sqrt{18x}+2\sqrt{8x}-3\sqrt{2x}=12\)
b.\(\sqrt{9x+18}+2\sqrt{36x+72}-\sqrt{4x+8}=26\)
c.\(\sqrt{\left(x-2\right)^2}=10\)
d.\(\sqrt{9x^2-6x+1}=15\)
e.\(\sqrt{3x+4}=3x-8\)