Radical din 12
Radical din 18
Radical din 20
Radical din 63
Radical din 452

[tex]a)\sqrt{12} = \sqrt{2 \times 2 \times 3} = \sqrt{(2 \times 2) \times 3} = \sqrt{ {2}^{2} \times 3 } = 2 \sqrt{3} [/tex]

[tex]b)\sqrt{18} = \sqrt{2 \times 3 \times 3} = \sqrt{(3 \times 3) \times 2} = \sqrt{ {3}^{2} \times 2 } = 3 \sqrt{2} [/tex]

[tex]c) \sqrt{20} = \sqrt{2 \times 2 \times 5} = \sqrt{(2 \times 2) \times 5} = \sqrt{ {2}^{2} \times 5 } = 2 \sqrt{5} [/tex]

[tex]d) \sqrt{63} = \sqrt{3 \times 3 \times 7} = \sqrt{(3 \times 3) \times 7} = \sqrt{ {3}^{2} \times 7 } = 3 \sqrt{7} [/tex]

[tex]e) \sqrt{452} = \sqrt{2 \times 2 \times 113} = \sqrt{(2 \times 2) \times 113} = \sqrt{ {2}^{2} \times 113 } = 2 \sqrt{113} [/tex]

[tex] \sqrt{12} = 2 \sqrt{3} [/tex]
sau 3,46 ...
[tex] \sqrt{18} = 3 \sqrt{2} [/tex]
sau 4,24 ...
[tex] \sqrt{20} = 2 \sqrt{5} [/tex]
sau 4,47...
[tex] \sqrt{63} = 3 \sqrt{7} [/tex]
sau 7,93...
[tex] \sqrt{452} = 2 \sqrt{113} [/tex]
sau 21, 26 ..