1)2,3,5,7
2)
[tex]\frac{80}{100},\frac{120}{140},\frac{240}{200},\frac{140}{180}\\
3) \frac{2}{3}, \frac{4}{6},\frac{7}{3},\frac{4}{7}\\
4) 150=2\cdot 3\cdot5^2\\
48=2^3\cdot3\\
5)a)x=50\\
b)x=214\\
c)x=238\\
d)30\\
e)9\\
6) a)\frac{176}{7}\\
b)-\frac{177}{15}\\
c)\frac{1}{2}\\
d)27+16-\frac{1}{4}=\frac{171}{4}
[/tex]
