Нужна помощь по мптематике.Пожалуйста

1) 1
2) 1
3) $\frac{6}{4} =1,5$
4) $- \frac{6}{4} =-1,5$
5) $5- \frac{7}{3} = \frac{15-7}{3} = \frac{8}{3}$
6) $5- \frac{19}{3} = \frac{15-19}{3} =- \frac{4}{3} 7) [tex] -5- \frac{19}{3} = \frac{-5-19}{3}=- \frac{24}{3} =-8$
8) $5* \frac{19}{3} = \frac{95}{3} =31 \frac{2}{3}$
9) $4* \frac{1}{12}= \frac{4}{12} = \frac{1}{3}$
10) $4 : \frac{1}{12} =4* \frac{12}{1} =48$
11) $-4+ \frac{1}{12} = \frac{-48+1}{12} = \frac{-47}{12} =-3 \frac{11}{12}$
12) $-4- \frac{1}{12}= \frac{-48-1}{12} = \frac{-49}{12} =-4 \frac{1}{12}$
13) $-4 \frac{1}{2} - \frac{1}{2} = \frac{-9}{2} - \frac{1}{2} = \frac{-9-1}{2} = \frac{-10}{2} =-5$
14) $-4 \frac{1}{2} + \frac{1}{2} = \frac{-9+1}{2} = \frac{-8}{2} =-4$
15) $1: \frac{7}{3} =1* \frac{3}{7} = \frac{3}{7}$