wkw 25/8-3 1/8  -29/7= -4 1/7   -58/17=-3 7/17

5 4/9=49/9  -4 3/7=-31/7  -3 12/13= -51/13


4 4/5+7/10=5 5/10=5 1/2
3 4/7:(-15)=25/7*(-1/15)=-5/21
4 7/8*(-4/13)=39/8*(-4/13)=-3/2=-1 1/2
6-3 3/8=2 5/8
-5 1/14+4/7=-5 1/14+8/7=-5 1/14+1 1/14=-4
-4 1/6:(-2 11/12)= -25/6: (-35/12)=-25/6*(-12/35)=10/7=1 3/7