M
maiphuong55


giai phuong trinh
x+2[tex]\sqrt{7-x}+2[tex]\sqrt{x-1}+[tex]\sqrt{-[tex]\frac{x^2+8x-7}+1[/tex]
x+2[tex]\sqrt{7-x}+2[tex]\sqrt{x-1}+[tex]\sqrt{-[tex]\frac{x^2+8x-7}+1[/tex]
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