Question

Помогите пожайлустя.

Answer 1

$a) -25,6 + 25,6 = 0$

$b) -3\frac{3}{4} +(-1,5) = -\frac{15}{4} -\frac{3}{2} = -\frac{21}{4} = -5\frac{1}{4}$

$v) 1\frac{2}{7} +3\frac{4}{5} = \frac{9}{7} + \frac{19}{5} = \frac{45+133}{35} = \frac{178}{35} =5\frac{3}{5}$

$g) -2\frac{3}{4} +(-\frac{1}{3} ) = -\frac{11}{4} -\frac{1}{3} = -\frac{37}{12} = -3\frac{1}{12}$

$-4,8+(2\frac{2}{3} +a),$ если $a=-\frac{5}{6}$

$-4,8+(2\frac{2}{3} +(-\frac{5}{6} )) =$

$= -\frac{24}{5} +(\frac{8}{3} -\frac{5}{6} )=$

$=-\frac{24}{5} +\frac{11}{6} =$

$=-\frac{89}{30} =$

$= -2\frac{29}{30}$

$x-2\frac{1}{7} =-3\frac{1}{5}$

$x-\frac{15}{7} = -\frac{16}{5}$

$x=-\frac{16}{5} +\frac{15}{7}$

$x=-\frac{37}{35}$

$x=-1\frac{2}{35}$