Question

Решите пожалуйста все 3 примера

Answer 1

$-1\frac{3}{8} +(-2\frac{5}{18} )=-\frac{1*8+3}{8} - \frac{2*18+5}{18} =-\frac{11}{8} -\frac{41}{18} =-\frac{9*11}{9*8} -\frac{4*41}{4*18} =-\frac{99}{72} -\frac{164}{72} = -\frac{263}{72} =-3\frac{47}{72}$

$-\frac{1}{7} +\frac{5}{28} =-\frac{4}{28} +\frac{5}{28} =\frac{-4+5}{28} =\frac{1}{28}$

$\frac{1}{6} +(-\frac{9}{11} )=\frac{11}{66} -\frac{54}{66} =\frac{11-54}{66} =-\frac{43}{66}$