4. Вычислите: 1)-5 ⋅ 49 ⋅ 4; 2)-2,5 ⋅ (-23) ⋅ 40; 3) 0,8 ⋅ (-125) ⋅ 0,5 ⋅ (-2); 4)-3,73 ⋅ 50 ⋅ (-2) ⋅ (-0,01); 5) \frac{7}{8} ⋅ (-4,5) ⋅ (-1\frac{1}{7}) ⋅ 0,4; 6) -\frac{4}{9} ⋅ (-\frac{3}{11}) ⋅ \frac{9}{16} ⋅ (-22).

Ответ: 1) -980; 2) 2300; 3) 100; 4) -3,73; 5) 0,1125; 6) -1,5

1) -5 ⋅ 49 ⋅ 4 = -5 ⋅ 4 ⋅ 49 = -20 ⋅ 49 = -980

2) -2,5 ⋅ (-23) ⋅ 40 = -2,5 ⋅ 40 ⋅ (-23) = -100 ⋅ (-23) = 2300

3) 0,8 ⋅ (-125) ⋅ 0,5 ⋅ (-2) = 0,8 ⋅ 0,5 ⋅ (-125) ⋅ (-2) = 0,4 ⋅ 250 = 100

4) -3,73 ⋅ 50 ⋅ (-2) ⋅ (-0,01) = -3,73 ⋅ (-100) ⋅ (-0,01) = 373 ⋅ (-0,01) = -3,73

5) \(\frac{7}{8} \cdot (-4,5) \cdot (-1\frac{1}{7}) \cdot 0,4\) = \(\frac{7}{8} \cdot (-4,5) \cdot (-\frac{8}{7}) \cdot 0,4\) = \(\frac{7}{8} \cdot (-\frac{8}{7}) \cdot (-4,5) \cdot 0,4\) = \(-1 \cdot (-4,5) \cdot 0,4\) = 4,5 \cdot 0,4 = 1,8

6) \(-\frac{4}{9} \cdot (-\frac{3}{11}) \cdot \frac{9}{16} \cdot (-22)\) = \(\frac{4}{9} \cdot \frac{3}{11} \cdot \frac{9}{16} \cdot (-22)\) = \(\frac{4 \cdot 3 \cdot 9 \cdot (-22)}{9 \cdot 11 \cdot 16}\) = \(\frac{4 \cdot 3 \cdot (-2)}{1 \cdot 1 \cdot 16}\) = \(\frac{12 \cdot (-2)}{16}\) = \(-\frac{24}{16}\) = \(-\frac{3}{2}\) = -1,5

Ответ: 1) -980; 2) 2300; 3) 100; 4) -3,73; 5) 0,1125; 6) -1,5