Question

Даю 100 балов!!
Надо номер 804 срочно надо!!!

Answer 1

$7a-(2-6a)+9-10a=7a-2+6a+9-10a=(7+6-10)a+7=3a+7\\3a+7=3*(-2)+7=-6+7=1\\3a+7=3*6+7=18+7=25$

$-3a-2(2a-2)+6a=-3a-4a+4+6a=(-3-4+6)a+4=-a+4\\-a+4=-(-2)+4=2+4=6\\-a+4=-1,5+4=2,5$

$2\frac{1}{6} a-4(1\frac{1}{8} a-6)-22\frac{1}{6} =2\frac{1}{6} a-\frac{4*9}{8} a+24-22\frac{1}{6}=23\frac{6}{6} -22\frac{1}{6}+2\frac{1}{6} a-4\frac{1}{2} a=1\frac{5}{6} +2\frac{2}{12} a-4\frac{6}{12} a=-2\frac{4}{12} a+1\frac{5}{6}=-2\frac{1}{3} a+1\frac{5}{6}\\-2\frac{1}{3} a+1\frac{5}{6}=-2\frac{1}{3} *\frac{1}{7} +1\frac{5}{6}=-\frac{7*1}{3*7} +1\frac{5}{6}=-\frac{1}{3} +1\frac{5}{6}=1\frac{5}{6}-\frac{2}{6} =1\frac{3}{6}=1\frac{1}{2} =1,5$

$-2\frac{1}{3} a+1\frac{5}{6}=-2\frac{1}{3} +1\frac{5}{6}=-2\frac{2}{6} +1\frac{5}{6}=-1\frac{8}{6} +1\frac{5}{6}=-\frac{3}{6} =-\frac{1}{2} =-0,5$