Вычислите а) 1.5*|-3| , б) |-0.75| : |25| , в) |-8.1| * |-3.2| , г) |-8.1| * |-3.2| , д) |-1.8| * |2| , е) |0.4| * |-5|

1) 1,5 * |- 3| = 1,5 * 3 = 15/1O * 3 = 45/1O = 4,5;

2) |- O,75| : |25| = 75/1OO : 25 = 75/1OO * 1/25 = (25 * 3)/(1OO * 25) = 3/1OO = O,O3;

3) |- 8,1| * |- 3,2| = 8,1 * 3,2 = 81/1O * 32/1O = (81 * 2 * 2 * 8)/(2 * 5 * 5 * 2) = 648/25 = 25 23/25 = 25,92;

4) |- 1,8| * |2| = 1,8 * 2 = 3,6;

5) |O,4| * |- 5| = O,4 * 5 = 4/1O * 5 = (4 * 5)/1O = 2O/1O = (2 * 1O)/1O = 2;

6) |1/12 + 5/12| = |(1 + 5)/12| = |6/12| = 6/12 = 6/(2 * 6) = O,5.

Ответ: 1) 4,5; 2) O,O3; 3) 25,92; 4) 3,6; 5) 2; 6) O,5.