Explicație pas cu pas:
[tex]a) \: (x + 2 \frac{8}{15}) \times \frac{3}{2} = 5 \frac{1}{4} \\ (x + \frac{38}{15} ) \times \frac{3}{2} = \frac{21}{4} \\ \frac{3}{2} x + \frac{19}{5} = \frac{21}{4} ) \times 20\\ 30x + 76 = 105 \\ 30x = 105 - 76 \\ 30x = 29 \\ x = \frac{29}{30} \\ \\ b) \: \frac{109}{50} \div y = \frac{109}{1000} \\ \frac{109}{50} \times \frac{1}{y} = \frac{109}{1000} \\ \frac{109}{50y} = \frac{109}{1000} \\ 50y = 1000) \div 50 \\ y = 20[/tex]
Succes!
