1) (-4 2/7+3 3/14)-1 1/2 2)-2 2/ 3/8-2 1/4) 3)-3,15-(4 1/2+3 3/4) буду .

1) (-4 2/7+3 3/14)-1 1/2 = - 2 4/7
1) - 4 4/14 + 3 3/14 = - 1 1/14 
2) - 1 1/14 - 1 7/14 = - 2 8/14 = - 2 4/7 

2)-2 2/5-(-3 3/8-2 1/4) = 3 3/5
1) - 3 3/8 - 2 1/4 = - 3 3/8 - 2 2/8 = - 5 5/8
2) - 2 2/5 + 5 5/8 = 3 3/5

3)-3,15-(4 1/2+3 3/4) = 11,4
1) 4 1/2 + 3 3/4 = 4 2/4 + 3 3/4 = 7 5/4 = 8 1/4 = 8,25
2) - 3,15 - 8,25 = - 11,4