Tinh:

a)\(\sqrt{\sqrt{2019}+\sqrt{2018}}.\sqrt{\sqrt{2019}-\sqrt{2018}}\)

b)\(\sqrt{4+\sqrt{15}}-\sqrt{4-\sqrt{15}}\)

Giai pt:

a)\(\sqrt{4x}=\sqrt{5}\)

b)\(\sqrt{4\left(1-x\right)^2}-6=0\)

c)\(\sqrt{x^2-4x+4}=3\)

cho bieu thuc P= (\(\frac{3x+\sqrt{9x}-3}{x+\sqrt{x}-2}+\frac{1}{\sqrt{x}-1}+\frac{1}{\sqrt{x}-3}\) ): \(\frac{1}{x-1}\)

^{a) Tim dieu kien de P co nghia, rut gon bieu thuc P.}

^{b) Tim cac so tu nhien x de \(\frac{1}{P}\)}la so tu nhien

c) Tinh gia tri cua P voi x= 4-\(2\sqrt{3}\)

Giup mk vs mk dang can gap

4 + 2 = 6

^_^ ^_^

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