Question

giúp em với ạ em cần gấp ạ

Answer 1

1: \(\sqrt{11}\) là số vô tỉ

2:

a: 4,9(18)=4,91818...

mà 4,91818<4,928

nên 4,9(18)<4,928

b: 4,315<4,318

=>-4,315>-4,318

=>-4,315...>-4,318...

c: \(\sqrt{3}=\sqrt{\dfrac{6}{2}}< \sqrt{\dfrac{7}{2}}\)

3: 

a: \(6=\sqrt{3};-1,7=-\sqrt{2,89}\)

0<2,89<3

=>\(0< \sqrt{2,89}< \sqrt{3}\)

=>\(-\sqrt{3}< -\sqrt{2,89}< 0\)

0<35<36<47

=>\(0< \sqrt{35}< \sqrt{36}< \sqrt{47}\)

=>\(-\sqrt{3}< -\sqrt{2,89}< 0< \sqrt{35}< \sqrt{36}< \sqrt{47}\)

=>\(-\sqrt{3}< -\sqrt{2,89}< 0< \sqrt{35}< 6< \sqrt{47}\)

b: \(-\sqrt{2\dfrac{1}{3}}=-\sqrt{2,\left(3\right)}\)

\(-1,5=-\sqrt{2,25}\)

2,25<2,3<2,(3)

=>\(\sqrt{2.25}< \sqrt{2.3}< \sqrt{2.\left(3\right)}\)

=>\(0>-1.5>-\sqrt{2.3}>-\sqrt{2\dfrac{1}{3}}\)

\(0< \sqrt{5\dfrac{1}{6}}=\sqrt{5,1\left(6\right)}< \sqrt{5,3}\)

=>\(\sqrt{5.3}>\sqrt{5\dfrac{1}{6}}>0>-1.5>-\sqrt{2.3}>-\sqrt{2\dfrac{1}{3}}\)