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Va rog mult! Am mare mare nevoie

Va Rog Mult Am Mare Mare Nevoie class=

Răspuns :

[tex]a) \frac{ {4.01 } ^{2} - {0.99}^{2} }{10} [/tex]

[tex] = \frac{( \frac{401}{100 } ) ^{2} - {( \frac{99}{100} )}^{2} }{10} [/tex]

[tex] = \frac{ \frac{ {401}^{2} }{ {100}^{2} } - \frac{ {99}^{2} }{ {100}^{2} } }{10} [/tex]

[tex] = \frac{ \frac{160801}{10000} - \frac{9801}{10000} }{10} [/tex]

[tex] = \frac{ \frac{160801 - 9801}{10000} }{10} [/tex]

[tex] = \frac{ 151000}{1000} [/tex]

[tex] = 151[/tex]

[tex]b) \sqrt{5 - 2 \sqrt{6} } \times \sqrt{5 + 2 \sqrt{6} } [/tex]

[tex] = \sqrt{(5 - 2 \sqrt{6} )(5 + 2 \sqrt{6} )} [/tex]

[tex] = \sqrt{ {5}^{2} - ( {2 \sqrt{6} )}^{2} } [/tex]

[tex] = \sqrt{25 - 24} [/tex]

[tex] = \sqrt{1} [/tex]

[tex] = 1[/tex]

[tex]c) \frac{14}{4 \sqrt{2} + 5} + 5 - 8 \sqrt{2} [/tex]

[tex] \frac{14}{4 \sqrt{2} + 5} + \frac{5(4 \sqrt{2} + 5)}{4 \sqrt{2} + 5} - \frac{8 \sqrt{2} (4 \sqrt{2} + 5) }{4 \sqrt{2} + 5} [/tex]

[tex] = \frac{14 + 20 \sqrt{2} + 25 - 32 \sqrt{4} - 40 \sqrt{2} }{4 \sqrt{2} + 5} [/tex]

[tex] = \frac{14 + 20 \sqrt{2} + 25 - 32 \times 2 - 40 \sqrt{2} }{4 \sqrt{2} + 5} [/tex]

[tex] = \frac{14 + 20 \sqrt{2} + 25 - 64 - 40 \sqrt{2} }{4 \sqrt{2 }+ 5 } [/tex]

[tex] = \frac{ - 25 - 20 \sqrt{2} }{4 \sqrt{2} + 5} [/tex]

[tex] = \frac{5( - 5 - 4 \sqrt{2} )}{4 \sqrt{2} + 5} [/tex]