Question

Calculati media aritmetica a nr a si b : a= 5supra3 - 3supra7. Si. b= 1supra3 + 3supra7

Answer 1

a=5/3-3/7=(5·7-3·3)/21=(35-9)/21=26/21
b=1/3+3/7=(1·7+3·3)/21=(7+9)/21=16/21
Ma=(a+b)/2=(26/21+16/21)/2=(42/26)/2=42/(26·2)=21/26

Answer 2

a=$\frac{5}{3} - \frac{3}{7}$
a=$\frac{35}{21} - \frac{9}{21} = \frac{26}{21}$

b=$\frac{1}{3} + \frac{3}{7}$
b=$\frac{7}{21} + \frac{9}{21} = \frac{16}{21}$

ma=$\frac{a+b}{2} = \frac{ \frac{26}{21}+ \frac{16}{21} }{2} = \frac{ \frac{42}{21} }{2} = \frac{2}{2} =1$