Question

Найдите значение вырожения: 1)-3,2-7,8-5,4+4,6 2)-4,28-1,,85)+(-9,06) 3)-5целых3/8+4целых5//4) 4)-3целых3/5+(-2целых1/3)+4целых8/15-1целая5//10)+1/2 с

Answer 1

1)-3,2-7,8-5,4+4,6=-16,4+4,6=-11,8
2)-4,28-1,53-(-7,85)+(-9,06)=-4,28-1,53+7,85-9,06=-14,87+7,85=-7,02
3)$-5\frac{3}{8}+4\frac{5}{6}-(-2\frac{1}{4})=-5\frac{3}{8}+4\frac{5}{6}+2\frac{1}{4}=-\frac{43}{8}+\frac{29}{6}+\frac{9}{4}=-\frac{43*3}{8*3}+\frac{29*4}{6*4}+\frac{9*6}{4*6}=\\\\-\frac{129}{24}+\frac{116}{24}+\frac{54}{24}=\frac{-129+116+54}{24}=\frac{41}{24}=1\frac{17}{24}$
4)$-3\frac{3}{5}+(-2\frac{1}{3})+4\frac{8}{15}-1\frac{5}{6}-(-6\frac{7}{10})+\frac{1}{2}= -3\frac{3}{5}-2\frac{1}{3}+4\frac{8}{15}-1\frac{5}{6}+6\frac{7}{10}+\frac{1}{2}= \\\\ -\frac{18}{5}-\frac{7}{3}+\frac{68}{15}-\frac{11}{6}+\frac{67}{10}+\frac{1}{2}=-\frac{18*6}{5*6}-\frac{7*10}{3*10}+\frac{68*2}{15*2}-\frac{11*5}{6*5}+\frac{67*3}{10*3}+\frac{1*15}{2*15}= \\\\ -\frac{108}{30}-\frac{70}{30}+\frac{136}{30}-\frac{55}{30}+\frac{201}{30}+\frac{15}{30}=\frac{-108-70+136-55+201+15}{30}=\frac{119}{30}=3\frac{29}{30}$