1) - 1/4-5/7 2) - 1/8-3/4 3)- 6 1/2-3 5/7 4)- 9 1/4 - 0,75 5) -27 - 5 9/20 6) - 5,8- 17 3/4

1) -7*1/7*4 - 4*5/4*7 = -7/28 - 20/28 = -7-20/28 =-27/28
2) -1*1/1*8 - 2*3/2*4 = -1/8 - 6/8 = -1-6/8 = -7/8
3) - 6*2+1/2 - 3*7+5/7 = -13/2 - 26/7 = -7*13/7*2 - 2*26/2*7 = -91/14 - 52/14 =
= -91-52/14 = -143/14 = - 10 3/14
4) 0,75= 75/100=3*25/4*28=3/4
- 9 1/4 - 3/4= - 9*4+1/4 - 3/4= -37/4 - 3/4= -37-3/ 4=-40/4=-10
5)-27 - 5 9/20= -27/1 - 5 9/20= -27/1 - 5*20+9/20= -27/1-109/20= -20*27/20*1 -1*109/1*20=
=-540/20 - 109/20= -540-109/20= -649/20= - 32 9/20
6) -5,8= - 5 8/10= - 5 4*2/5*2= -5 4/5
-5*5+4/5 -17*4+3/5= -29/5 - 71/4= -4*29/4*5 - 5*71/5*4= -116/20 -355/20= -116-355/20= -471/20= -23 11/20