Вычисли а)-0,4-1/3=?б)0,01*(-4,6)=?в)-1,4*(-2/7)=?г)-1:5/7=? д)-0,36(-3/5)=? е)0:(-2,8)=?

Вычислим значения выражений:

1) -0,4 - 1/3 = -(0,4 + 1/3) = -(4/10 + 1/3) = -((4 * 3)/30 + (1 * 10)/30) = -(12/30 + 10/30) = -22/30 = -11/15;

2) 0,01 * (-4,6) = 1/100 * (-46/10) = -46/(100 * 10) = -46/1000 = -0,046;

3) -1,4 * (-2/7) = 1,4 * 2/7 = 14/10 * 2/7 = (14 * 2)/(10 * 7) = (7 * 2 * 2)/(5 * 2 * 7) = 2/5;

4) -1 : 5/7 = -1 * 7/5 = -7/5 = -1 2/5;

5) -0,36 * (-3/5) = 0,36 * 3/5 = 36/100 * 3/5 = (36 * 3)/(100 * 5) = 108/500 = (4 * 27)/(4 * 125) = 27/125;

6) 0 : (-2,8) = 0 : (-28/10) = 0 * (-10/28) = 0.