khong vo nghiem dau ban a, nham nghiem thi no ra x=1 do ban
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giai phuong trinh
x*(2x+3)2 -4x2+9=0
\(x-\sqrt{x-3}-5=0\)
\(x^3-4x^2-3x+6=0\)
\(3x^3+4x^2-5x-6=0\)
\(\sqrt{x^2+4x+8}+\sqrt{x^2+4x+4}=\sqrt{2\cdot\left(x^2+4x+6\right)}\)
Giai phuong trinh ; 2\(\sqrt{x^2-x}-2\sqrt{x}\sqrt{2x-1}+3x=1\)
giai phuong trinh:\(^{x^2+3x-x\sqrt{x^2+2}=1+2\sqrt{x^2+2}.}\)
giai he phuong trinh
\(\hept{\begin{cases}x^2-4\sqrt{3x-2}+10=2y\\y^2-6\sqrt{4y-3}+11=x\end{cases}}\)
giai phuong trinh \(\sqrt{5-x^6}-\sqrt{3x^4-2}=1\)
Giai phuong trinh \(x\sqrt{x^2-x+1}+2\sqrt{3x+1}=x^2+x+3\)
giai phuong trinh
4x2+\(\sqrt{3x+1}\)+5=13x
Giai phuong trinh:
\(28+\sqrt[3]{x^2}=3x+2\sqrt[3]{x}+\left(x-4\right)\sqrt{x-7}\)
Giai phuong trinh: \(\sqrt{5-x^6}=\sqrt[3]{3x^4-2}+1\)