Răspuns:
2. a)
[tex]1.3 + 2.5 = \frac{13}{10} + \frac{25}{10 } = \frac{38}{10} = 3.8[/tex]
b)
[tex]128.15 + 37.85 = \frac{12815}{100} + \frac{3785}{100} = 16600 \div 100 = 166[/tex]
c)
[tex]4.21 + ( - 3.196) = \frac{421}{100} - \frac{3196}{1000} = \frac{4210}{1000} - \frac{3196}{1000} = 1014 \div 1000 = 1.014[/tex]
5. a)
[tex] \frac{3}{4} - \frac{1}{2} = \frac{6}{8} - \frac{4}{8} = \frac{2}{8} = 0.25[/tex]
b)
[tex] \frac{5}{6} - ( - \frac{1}{4} ) = \frac{5}{6} + \frac{1}{4} = \frac{10}{12} + \frac{3}{12} = \frac{13}{12} = 1.08(3)[/tex]
c)
[tex] - \frac{3}{4} - \frac{1}{2} = - \frac{6}{8} - \frac{4}{8} = - \frac{10}{8} = - 1.25[/tex]
succes!
