Răspuns :

Iakabcristina2id

Răspuns:

[tex] \sqrt{28} = \sqrt{ {2}^{2} \times 7} = 2 \sqrt{7} [/tex]

[tex] \sqrt{112} = \sqrt{ {2}^{4} \times 7 } = 4 \sqrt{7} [/tex]

[tex] \sqrt{162} = \sqrt{2 \times {3}^{4} } = 9 \sqrt{2} [/tex]

[tex] \sqrt{8} = \sqrt{ {2}^{3} } = 2 \sqrt{2} [/tex]

[tex]b = - 2\sqrt{7} + 8 \sqrt{2} [/tex]

[tex]b = 2(4 \sqrt{2} - \sqrt{7)} [/tex]

Maverickarcherid

b = √28 - √112 + √162 + √2 - √8 = √(2²·7) - √(2²·2²·7) + √(9²·2) + √2 - √(2²·2) = 2√7 - 2·2·√7 + 9√2 + √2 - 2√2 = 2√7 - 4√7 + 9√2- √2 = - 2√7 + 8√2

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Eventual cum am ajuns la valoarea lui a:

a = √175 - √98 - √63 + 3√50 = √(5²·7) - √(7²·2) - √(3²·7) + 3·√(5²·2) = 5√7 - 7√2 - 3√7 + 3·5√2 = 2√7 - 7√2 + 15√2 = 2√7 + 8√2

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