a)-2(-50)612; 6) 11 (-4) (-7).25; в) -0,2 0,8 (-5) (-1,25); г) -\frac{2}{3} (-\frac{5}{14}) (-\frac{3}{8}) \frac{7}{5}; д)-3\frac{1}{3} (-\frac{12}{7}) (-3)-(-7); e) -0,2-2\frac{3}{5} (-0,5). (-\frac{5}{13}).

а) -2 ⋅ (-50) ⋅ 6 ⋅ 12 = 100 ⋅ 6 ⋅ 12 = 600 ⋅ 12 = 7200

б) 11 ⋅ (-4) ⋅ (-7) ⋅ 25 = -44 ⋅ (-7) ⋅ 25 = 308 ⋅ 25 = 7700

в) -0,2 ⋅ 0,8 ⋅ (-5) ⋅ (-1,25) = -0,16 ⋅ (-5) ⋅ (-1,25) = 0,8 ⋅ (-1,25) = -1

г) -\frac{2}{3} ⋅ (-\frac{5}{14}) ⋅ (-\frac{3}{8}) ⋅ \frac{7}{5} = \frac{2}{3} ⋅ \frac{5}{14} ⋅ \frac{3}{8} ⋅ \frac{7}{5} = (\frac{2}{2}) ⋅ (\frac{3}{3}) ⋅ (\frac{5}{5}) ⋅ (\frac{7}{7}) ⋅ \frac{1}{14} ⋅ \frac{1}{8} = \frac{1}{1} ⋅ \frac{1}{1} ⋅ \frac{1}{1} ⋅ \frac{1}{1} ⋅ \frac{1}{14} ⋅ \frac{1}{8} = 1 ⋅ \frac{1}{14} ⋅ \frac{1}{8} = \frac{1}{112}

д) -3\frac{1}{3} ⋅ (-\frac{12}{7}) ⋅ (-3) ⋅ (-7) = -\frac{10}{3} ⋅ (-\frac{12}{7}) ⋅ (-3) ⋅ (-7) = \frac{10}{3} ⋅ \frac{12}{7} ⋅ 3 ⋅ (-7) = (\frac{3}{3}) ⋅ (\frac{7}{7}) ⋅ 10 ⋅ \frac{12}{1} ⋅ (-1) = 1 ⋅ 1 ⋅ 10 ⋅ 12 ⋅ (-1) = -120

е) -0,2 ⋅ 2\frac{3}{5} ⋅ (-0,5) ⋅ (-\frac{5}{13}) = -\frac{1}{5} ⋅ \frac{13}{5} ⋅ (-\frac{1}{2}) ⋅ (-\frac{5}{13}) = (\frac{5}{5}) ⋅ (\frac{13}{13}) ⋅ \frac{1}{5} ⋅ \frac{1}{5} ⋅ \frac{1}{2} ⋅ (-1) = 1 ⋅ 1 ⋅ \frac{1}{5} ⋅ \frac{1}{5} ⋅ \frac{1}{2} ⋅ (-1) = -\frac{1}{50}