Question

пж, 20баллов,зарание сяб​

Answer 1

$\displaystyle \frac{1}{2}(-6,8n-2,2m)-\frac{2}{5}(-15nm+25n)=\frac{1}{2}(-\frac{34}{5}n-\frac{11}{5}m)-\frac{2}{5}(-15mn+25n)=\\\\-\frac{17}{5}n-\frac{11}{10}m-\frac{2}{5}(-3mn+5n)=-\frac{17}{5}n-\frac{11}{10}m-2(-3mn+5n)=\\\\-\frac{17}{5}n-\frac{11}{10}m+6mn-10n=-\frac{67}{5}n-\frac{11}{10}m+6mn=-13,4n-1,1m+6mn$