Zadanie 1
\sqrt{5\frac{1}{3}} * \sqrt{3} =\sqrt{\frac{16}{3}}*\sqrt3=\frac{4}{\sqrt3}*\sqrt3=4
\sqrt{9 \frac{4}{5} } * \sqrt{5} =\sqrt{\frac{49}{5}}*\sqrt5=\frac{7}{\sqrt5}*\sqrt5=7
Zadanie 2
38000000=3,8*10^7
Zadanie 3
6ab^{3} + 8a^{2} b^{2}=2ab^2(3b+4a)
12x^2 + 8y - 16=4(3x^2+2y-4)