[tex]a) - 5 \times ( - 1.2) \times ( - 7) = 6 \times ( - 7) = - 42[/tex]

[tex]b) - 12.5 \times 2.4 \times ( - 3) \times ( - 5) = - 30 \times 15 = - 450[/tex]

в)-5/7 * 7/5 * 3/8 * (-2/3)= -1 * -1/4= 1/4

г)-0,7 * (-2/9) * 45= -0,7 * -10=7