[tex]a)( - \frac{3}{4} ) - ( - \frac{1}{3}) + ( - \frac{2}{5} ) = \\ \\ = - \frac{3}{4} + \frac{1}{3} - \frac{2}{5} \\ \\ = \frac{ - 45 + 20 - 24}{60} = \frac{ - 49}{60} = - \frac{49}{60} [/tex]
[tex]b) \frac{5}{3} - \frac{1}{4} + \frac{2}{7} = \\ \\ = \frac{140 - 21 + 24}{84} = \frac{143}{84} [/tex]
ᗩՏՏ: Տaꪑ ᗰacan ꨄ︎
