\(A=\sqrt{\dfrac{\left(x^2-3\right)^2+12x^2}{-x^2}}+\sqrt{\dfrac{\left(x+2\right)^2}{-8x}}\)
Rút gọn
Giải các pt sau:
a) \(\sqrt{x+8}+\frac{9x}{\sqrt{x+8}}-6\sqrt{x}=0\)
b) \(x^4-2x^3+\sqrt{2x^3+x^2+2}-2=0\)
c) \(3x\sqrt[3]{x+7}\left(x+\sqrt[3]{x+7}\right)=7x^3+12x^2+5x-6\)
d) \(4x^2+\left(8x-4\right)\sqrt{x}-1=3x+2\sqrt{2x^2+5x-3}\)
e) \(16x^2+19x+7+4\sqrt{-3x^2+5x+2}=\left(8x+2\right)\left(\sqrt{2-x}+2\sqrt{3x+1}\right)\)
f) \(\left(5x+8\right)\sqrt{2x-1}+7x\sqrt{x+3}=9x+8-\left(x+26\right)\sqrt{x-1}\)
g) \(\sqrt[3]{3x+1}+\sqrt[3]{5-x}+\sqrt[3]{2x-9}-\sqrt[3]{4x-3}=0\)
\(A=\sqrt{\dfrac{\left(x^2-3\right)^2+12x^2}{x^2}}+\sqrt{\dfrac{\left(x+2\right)^2}{-8x}}\)
a)Rút gọn
b)Tìm x thuộc Z để A thuộc Z
Giải pt:b)\(8x^3-12x^2+6x-5=0\)
a)\(x^3-\sqrt{3}x^2-x+3\sqrt{3}=0\)
b
Cho A = \(\frac{2x+15\sqrt{x}+18}{x+3\sqrt{x}-18}+\frac{3x+4\sqrt{x}+1}{2x-3\sqrt{x}-5}-\frac{8x-15\sqrt{x}}{2x\sqrt{x}-11x+5\sqrt{x}}\)
Tính A tại \(x=\sqrt[3]{2+\sqrt{5}}+\sqrt[3]{2-\sqrt{5}}\)
Giải phương tình:
a) \(x^2-7x+\sqrt{x^2-7x+8}=12
\)
b)\(\sqrt{3x^2+12x+16}+\sqrt{y^2-4y+13}=5\)
c)\(\sqrt{x-3}+\sqrt{5-x}=x^2-8x+18\)
Cho: \(x=\dfrac{4\sqrt{4-\sqrt{5+\sqrt{21+\sqrt{80}}}}}{\sqrt{10}-\sqrt{2}}\)
Tính\(P=\left(x^3-4x+1\right)^{2018}\)
Giải PT:
a) x2+y2+\(\frac{1}{x^2}\)+\(\frac{1}{y^2}\)=4
b) \(\sqrt{3x^2+12x+13}+\sqrt{2x^2+8x+17}=4\)
Cho \(x=\dfrac{\sqrt[3]{26+15\sqrt{3}}.\left(2-\sqrt{3}\right)}{\sqrt[3]{9+\sqrt{80}}+\sqrt[3]{9-\sqrt{80}}}\). Tính giá trị của biểu thức: \(M=\left(3x^3-x^2-1\right)^{2021}\)