4. Вычислите: 1)-642(-5); 2)-0,41925; 3) 1,25(-8)·(-0,5) (-2); 4) 4,78(-4) 25.(-0,001); 5)·(-2,6)·0,6·(-2); 6)-(-)(-58).

1) -6 ⋅ 42 ⋅ (-5) = -6 ⋅ (-5) ⋅ 42 = 30 ⋅ 42 = 1260

2) -0,4 ⋅ 19 ⋅ 25 = -0,4 ⋅ 25 ⋅ 19 = -10 ⋅ 19 = -190

3) 1,25 ⋅ (-8) ⋅ (-0,5) ⋅ (-2) = 1,25 ⋅ (-8) ⋅ (-0,5 ⋅ -2) = 1,25 ⋅ (-8) ⋅ 1 = -10 ⋅ 1 = -10

4) 4,78 ⋅ (-4) ⋅ 25 ⋅ (-0,001) = 4,78 ⋅ (-4 ⋅ 25) ⋅ (-0,001) = 4,78 ⋅ (-100) ⋅ (-0,001) = -478 ⋅ (-0,001) = 0,478

5) \(\frac{5}{7} ⋅ (-2,6) ⋅ 0,6 ⋅ (-2 \frac{1}{3}) = \frac{5}{7} ⋅ (-2,6) ⋅ 0,6 ⋅ (-\frac{7}{3}) = \frac{5}{7} ⋅ (-\frac{26}{10}) ⋅ \frac{6}{10} ⋅ (-\frac{7}{3}) = \frac{5}{7} ⋅ (-\frac{13}{5}) ⋅ \frac{3}{5} ⋅ (-\frac{7}{3}) = \frac{5}{7} ⋅ \frac{7}{3} ⋅ \frac{13}{5} ⋅ \frac{3}{5} = 1 ⋅ \frac{13}{5} = \frac{13}{5} = 2,6\)

6) \(-\frac{8}{9} ⋅ (-\frac{5}{29}) ⋅ \frac{9}{16} ⋅ (-58) = \frac{8}{9} ⋅ \frac{5}{29} ⋅ \frac{9}{16} ⋅ (-58) = \frac{8}{16} ⋅ \frac{9}{9} ⋅ \frac{5}{29} ⋅ (-58) = \frac{1}{2} ⋅ 1 ⋅ \frac{5}{29} ⋅ (-58) = \frac{1}{2} ⋅ \frac{5}{1} ⋅ (-2) = 1 ⋅ 5 ⋅ (-1) = -5\)