Giúp mình giải bài này với ạ Đề :giải pt sau :\(\dfrac{\left(x+3\right)\left(x-3\right)}{3}+2=x.\left(1-x\right)\)
a. \(\sqrt{x}\left(\sqrt{x}-3\right)-5\left(\sqrt{x}+3\right)\)
b. \(3\left(2+\sqrt{x}\right)+\left(\sqrt{x}+3\right)\left(2-\sqrt{x}\right)\)
c. \(\left(\sqrt{x}+3\right)\left(\sqrt{x}-3\right)-5\left(\sqrt{x}-1\right)\)
d. \(3\left(\sqrt{x}-2\right)-\left(\sqrt{x}-1\right)\left(\sqrt{x}+1\right)\)
Giải phương trình :
a, \(x-\sqrt{2}+3\left(x^2-2\right)=0\)
b, \(x^2-5=\left(2x-\sqrt{5}\right)\left(x+\sqrt{5}\right)\)
Rút gọn
a,\(E=\sqrt{\left(3x+1\right)^2}+3\sqrt{\left(1-x\right)^2}\) với x<1
b,\(F=\sqrt{\left(2x+4\right)^2}+2\sqrt{\left(3-x\right)^2}\)
Giải các phương trình sau:
a, \(\left(\sqrt{x+5}-\sqrt{x+2}\right)\left(1+\sqrt{x^2+7x+10}\right)=3\)
b,\(\dfrac{2x^2}{\left(3-\sqrt{9+2x}\right)^2}=x+21\)
Giải các phương trình sau:
a, \(\left(\sqrt{x+5}-\sqrt{x+2}\right)\left(1+\sqrt{x^2+7x+10}\right)=3\)
b,\(\dfrac{2x^2}{\left(3-\sqrt{9+2x}\right)^2}=x+21\)
Tính
\(A=\left(\frac{2x+1}{2x-1}-\frac{2x-1}{2x+1}\right):\frac{4x}{10-5}\)
\(B=\left(\frac{1}{x^2+x}-\frac{2-x}{x+1}\right):\left(\frac{1}{x}+x-2\right)\)
\(C=\frac{1}{x-1}-\frac{x^3-x}{x^2+1}\left(\frac{1}{x^2-2x+1}+\frac{1}{1-x^2}\right)\)
Cho \(x=\frac{1}{2}\sqrt{\frac{\sqrt{2}-1}{\sqrt{2}+1}}\). Tính:
\(M=\left(4x^5+4x^4-x^3+1\right)^{19}+\left(\sqrt{4x^5+4x^4-5x^3+5x+3}\right)^3+\left(\frac{1-\sqrt{2}}{\sqrt{2x^2+2x}}\right)^{2016}\)
Tìm x bt:
\(\sqrt{x^2+2x+1}\) = -x
Rút gọn:
a, \(\sqrt{\left(4-\sqrt{17}\right)}^2\) - \(\sqrt{17}\)
b, \(\sqrt{\left(5-2\sqrt{3}\right)^2}\) - \(2\sqrt{3}\)