Răspuns:
[tex]a+b=5\frac{9}{80} =\frac{5*80+9}{80}=\frac{409}{80}[/tex]
a) [tex]a=2\frac{5}{16} =\frac{38(2}{16} =\frac{19}{8}[/tex]
[tex]\frac{19}{8} +b=\frac{409}{80}[/tex] /*80
190+80b=409 80b=219
[tex]b=\frac{219}{80}=\frac{2*80+59}{80} =2\frac{59}{80}[/tex]
b) [tex]a=3\frac{1}{20} =\frac{61}{20}[/tex]
[tex]\frac{61}{20} +b=\frac{409}{80}[/tex] /*80
244+80b=409 80b=165 /:5 16b=33
[tex]b=\frac{33}{16} =2\frac{1}{16}[/tex]
c) [tex]a=4\frac{3}{10} =\frac{43}{10}[/tex]
[tex]\frac{43}{10} +b=\frac{409}{80}[/tex] /*80
344+80b=409
80b=65 /:5 16b=13
[tex]b=\frac{13}{16}[/tex]
Explicație pas cu pas:
