Question

VA ROG AM NEVOIE URGENT !!!! DAU MAXIM DE PUNCTE SI COROANA ! VA ROGG!!!!!!!


Aratati ca numerele a , b , c sunt intregi:
a=4 √10 -2√8 -(6+4√10)=?
b=2(4+√21)-6√7+2√7 * (3-√3)=?
c=4√3(√8-√3)-2√2 * (3√3-√2)=?

Answer 1

$a = 4 \sqrt{10} - 2 \sqrt{8} - (6 + 4 \sqrt{10}) \\ \\ a = 4 \sqrt{10} - 2 \sqrt{8} - 6 - 4 \sqrt{10} \\ \\ a = 4 \sqrt{10} - 2 \times 2 \sqrt{2} - 6 - 4 \sqrt{10} \\ \\ a = 4 \sqrt{10} - 4 \sqrt{2} - 6 - 4 \sqrt{10} \\ \\ a = - 4 \sqrt{2} - 6$

$b = 2(4 + \sqrt{21}) - 6 \sqrt{7} + 2 \sqrt{7} \times (3 - \sqrt{3}) \\ \\ b = 8 + 2 \sqrt{21} - 6 \sqrt{7} + 6 \sqrt{7} - 2 \sqrt{21} \\ \\ b = 8 + 2 \sqrt{21} - 2 \sqrt{21} \\ \\ b = 8$

Answer 2

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