So sanh:

a, \(2-2\sqrt{3}\) va \(4-\sqrt{15}\)

b, \(\sqrt{11}+2\) va \(3+\sqrt{3}\)

Cho \(xy+\sqrt{\left(1+x\right)^2\left(1+y\right)^2}=\sqrt{2017}\)

Tinh gia tri cua bieu thuc: \(P=x+\sqrt{1+y^2}+y\sqrt{1+x^2}\)

Giup mk!!!

Co cac dung dich: Na2CO3, BaCl2, Mg(NO3)2, H2SO4, NaOH. Cho cac dung dich do phan ung tung doi mot, so cap chat phan ung la bao nhieu?

Cho dung dich X vao dung dich Y thu duoc ket tua trang, ket tua nay khong tan trong dung dich HCl. Vay dung dich X va Y la:

A. Na₂CO₃ va BaCl₂. B. NaOH va CuSO₄

C. Na₂SO₄ va Ba(OH)₂ D. BaCO₃ va K₂SO₄

Cho A = \(\left(\dfrac{\sqrt{x}+\sqrt{y}}{1-\sqrt{xy}}+\dfrac{\sqrt{x}-\sqrt{y}}{1+\sqrt{xy}}\right):\left(1+\dfrac{x+y+2xy}{1-xy}\right)\)

a, Rut gon bieu thuc A

b, Tinh gia tri cua A khi x = \(\dfrac{1}{1+\sqrt{2}}\)

c, Tim Max A

So sanh:

a, \(\sqrt{\dfrac{35}{34}}\) va \(\sqrt{\dfrac{71}{70}}\)

b, \(4\sqrt{5}-3\sqrt{2}\) va 5