Phân tích đa thức thành nhân tử:
\(8+3\sqrt{3}x^3\)
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\(2+\sqrt{3}+\sqrt{6}+\sqrt{8}=2+\sqrt{3}+\sqrt{6}+2\sqrt{2}\)
\(=2+\sqrt{3}+\sqrt{2}\left(2+\sqrt{3}\right)=\left(2+\sqrt{3}\right)\left(\sqrt{2}+1\right)\)
\(2+\sqrt{3}+\sqrt{6}+\sqrt{8}=\left(\sqrt{2}+1\right)\left(2+\sqrt{3}\right)\)
a) \(x^3+9x^2+27x+27=\left(x+3\right)^3\)
b) \(3\sqrt{3x^3}+18x^2+12\sqrt{3x}+8=\left(\sqrt{3x}+2\right)^3\)
c) \(\dfrac{1}{4}-x^2=\left(\dfrac{1}{2}-x\right)\left(\dfrac{1}{2}+x\right)\)
\(8-\frac{x\sqrt{x}}{3}\)
\(=8-\frac{\sqrt{x^3}}{3}\)
\(=8-\frac{\left(\sqrt{x}\right)^3}{3}\)
\(=8-\frac{\left(\sqrt{x}\right)^3}{\left(\sqrt[3]{3}\right)^3}\)
\(=2^3-\left(\frac{\sqrt{x}}{\sqrt[3]{3}}\right)^3\)
\(=\left(2-\frac{\sqrt{x}}{\sqrt[3]{3}}\right)\left(4+\frac{2\sqrt{x}}{\sqrt[3]{3}}+\frac{x}{\left(\sqrt[3]{3}\right)^2}\right)\)
Đặt: \(A=\sqrt{3+\sqrt{8}}\)
=> \(\sqrt{2}A=\sqrt{6+2\sqrt{8}}=\sqrt{\left(2+\sqrt{2}\right)^2}=2+\sqrt{2}=\sqrt{2}\left(\sqrt{2+1}\right)\)
=> \(A=\sqrt{2}+1\)
\(3+\sqrt{18}+\sqrt{3+\sqrt{8}}=3+3\sqrt{2}+\sqrt{2}+1\)
\(=3\left(\sqrt{2}+1\right)+\left(\sqrt{2}+1\right)=4.\left(\sqrt{2}+1\right)\)
\(x-6\sqrt{x-3}+6\text{=}x-3-6\sqrt{x-3}+9\)
\(\text{=}\left(\sqrt{x-3}\right)^2-2.3.\sqrt{x-3}+\left(3\right)^2\)
\(\text{=}\left(\sqrt{x-3}-3\right)^2\)
A = \(x-6\)\(\sqrt{x-3}\) + 6 (đkxd \(x>3\))
A = (\(x\) - 3) - 2.3.\(\sqrt{x-3}\) + 9
A = (\(\sqrt{x-3}\))2 - 2.3.\(\sqrt{x-3}\) + 32
A = (\(\sqrt{x-3}\)- 3)2
\(x-\sqrt{x}-6=\left(\sqrt{x}-3\right)\left(\sqrt{x}+2\right)\)
\(2x+5\sqrt{x}-3=\left(\sqrt{x}+3\right)\left(2\sqrt{x}-1\right)\)
\(8+3\sqrt{3}x^3\)
\(=2^3+\left(1\sqrt{3}x\right)^3\)
\(=\left(2+1\sqrt{3}x\right)\left(4-2\sqrt{3}x+3x^2\right)\)
(Nhớ k cho mình với nhá!)