Salut,
a)
A =
[tex]1 + \frac{1}{1 + \frac{1}{3} } \\ = 1 + \frac{ \frac{1}{4} }{3} \\ = 1 + \frac{3}{4} \\ = \frac{7}{4} = 1.75[/tex]
B =
[tex]1 + \frac{1}{1 + \frac{1}{1 + \frac{1}{3} } } \\ = 1 + \frac{1}{1 + \frac{ \frac{1}{4} }{3} } \\ = 1 + \frac{1}{1 + \frac{3}{4} } \\ = 1 + \frac{ \frac{1}{7} }{4} \\ 1 + \frac{4}{7} \\ = \frac{11}{7} = 1.571428...[/tex]
b) A×B = 7/4×11/7
= 1/4×11
= 11/4
A+B = 7/4+11/7
= (49+44)/28
= 93/28
