C \(=\sqrt[3]{x^3+1+3x\left(x+1\right)}-\sqrt[3]{\left(x-1\right)^3}\)
\(=\sqrt[3]{x^3+1+3x^2+3x}-\sqrt[3]{\left(x-1\right)^3}\)
\(=\sqrt[3]{\left(x+1\right)^3}-\sqrt[3]{\left(x-1\right)^3}\)
\(=x+1-\left(x-1\right)\)
\(=x+1-x+1\)
\(=2\)
C \(=\sqrt[3]{x^3+1+3x\left(x+1\right)}-\sqrt[3]{\left(x-1\right)^3}\)
\(=\sqrt[3]{x^3+1+3x^2+3x}-\sqrt[3]{\left(x-1\right)^3}\)
\(=\sqrt[3]{\left(x+1\right)^3}-\sqrt[3]{\left(x-1\right)^3}\)
\(=x+1-\left(x-1\right)\)
\(=x+1-x+1\)
\(=2\)
A =\(\dfrac{x\sqrt[]{x}-3}{x-2\sqrt[]{x}-3}-\dfrac{2\left(\sqrt[]{x}-3\right)}{\sqrt[]{x}+1}+\dfrac{\sqrt[]{x}+3}{3-\sqrt[]{x}}\)
a. rút gọn A
b. Tính A với x = \(14-6\sqrt[]{5}\)
c. tìm min A
A=\(\dfrac{x\sqrt{x}-3}{x-2\sqrt{x}-3}-\dfrac{2\left(\sqrt{x}-3\right)}{\sqrt{x}+1}+\dfrac{\sqrt{x}+3}{3-\sqrt{x}}\)
a) Rút gọn A
b) Tính A với x=14-6\(\sqrt{5}\)
c) Tìm Min A
8.cho biểu thức:p=\(\left(\dfrac{2a+1}{\sqrt{a^3}+1}-\dfrac{\sqrt{a}}{a+\sqrt{a}+1}\right).\left(\dfrac{1+\sqrt{a^3}}{1+\sqrt{a}}-\sqrt{a}\right)\)
a)rút gọn p
b)xét dấu của biểu thức p .\(\sqrt{1-a}\)
Rút gọn BT với \(x>0;x\ne8\)
\(P=\dfrac{8-x}{2+\sqrt[3]{x}}:\left(2+\dfrac{\sqrt[3]{x^2}}{2+\sqrt[3]{x}}\right)+\left(\sqrt[3]{x}+\dfrac{2\sqrt[3]{x}}{\sqrt[3]{x}-2}\right)\left(\dfrac{\sqrt[3]{x^2}-1}{\sqrt[3]{x^2}+2\sqrt[3]{x}}\right)\)
GIẢI PHƯƠNG TRÌNH
1. \(\sqrt[3]{\left(3x+1\right)^2}+\sqrt[3]{\left(3x-1\right)^2}+\sqrt[3]{9x^2-1}=1\)
2. \(\sqrt[3]{\dfrac{1}{2}+x}+\sqrt[3]{\dfrac{1}{2}-x}=1\)
CÁC BẠN GIÚP MÌNH VỚI!
Rút gọn biểu thức:
\(B=\left(\dfrac{b}{b+8}-\dfrac{4b}{\left(\sqrt[3]{b}+2\right)^3}\right)\left(\dfrac{1+2\sqrt[3]{\dfrac{1}{b}}}{1-2\sqrt[3]{\dfrac{1}{b}}}\right)^2-\dfrac{24}{b+8}\)
7.cho biểu thức:
\(P=\left(\dfrac{\sqrt{x}+1}{\sqrt{2x}+1}+\dfrac{\sqrt{2x}+\sqrt{x}}{\sqrt{2x}-1}-1\right):\left(1+\dfrac{\sqrt{x}+1}{\sqrt{2x}+1}-\dfrac{\sqrt{2x}+\sqrt{x}}{\sqrt{2x}-1}\right)\) a)rút gon P
b)tính giá trị của P khi x =\(\dfrac{1}{2}\left(3+2\sqrt{2}\right)\)
Tính P\(=\left(x^3+12x-9\right)^{2021}\) khi \(x=\sqrt[3]{4\left(\sqrt{5}+1\right)}-\sqrt[3]{4\left(\sqrt{5}-1\right)}\)
Rút gọn biểu thức sau:
a)M=\(3x-\sqrt[3]{27^3+27x^2+9x+1}\)
b)N=\(\sqrt[3]{8x^3+12x^2+6x+1}-\sqrt[3]{x^3}\)