Вычеслите удобным способом 1) 14,3 + 41,2 + 15,7 - 6,2; 2) 4/13 + 3/13 + 5/13 - 4/13 - 8/13; 3) -25,9 - 13,4 -24,1 -

1) 14,3 + 41,2 + 15,7 - 6,2 = (14,3 + 15,7) + (41,2 - 6,2) = 30 + 35 = 65;

2) 4/13 + 3/13 + 5/13 - 4/13 - 8/13 = (4/13 - 4/13) + (3/13 + 5/13 - 8/13) = 8/13 - 8/13 = 0;

3) -25,9 - 13,4 - 24,1 - 16,6 = -(25,9 + 24,1) - (13,4 + 16,6) = -50 - 30 = -80;

4) -3 2/3 + (-2 5/6 ) + 3 3/4 + (-3 3/8) = -(3 * 3 + 2)/3 - (2 * 6 + 5)/6 + (3 * 4 + 3)/4 - (3 * 8 + 3)/8 = -11/3 - 17/6 + 15/4 - 27/8 = -22/6 - 17/6 + 30/8 - 27/8 = -(22 + 17)/6 + (30 - 27)/8 =  -39/6 + 3/8 = -13/2 + 3/8 = -52/8 + 3/8 = -49/8.