Odpowiedź:
7/8+3/8= 10/8= 1 2/8
5 8/13+2 5/13= 7 13/13=8
3/8-1/8= 2/8= 1/4
9 2/3-6 3/4= 29/3-27/4= 116/12-81/12= 35/12= 2 11/12
7/8-3/5= 56/40-24/40= 32/40= 4/5
8-2 1/3= 7 3/3-2 1/3= 5 2/3
4/5:2= 4/5:10/5= 4/5*5/10= 2/5
8/9:16/27= 8/9*27/16= 3/2= 1 1/2
11 1/4:5= 45/4*1/5= 9/4= 2 1/4
5 5/8: 1 1/4= 45/8:5/4= 45/8*4/5= 9/2= 4 1/2
3 3/10: 1 7/15= 33/10: 22/15= 33/10*15/22= 9/4= 2 1/4
4/9*3/8= 12/72= 1/6
21/63*18/35= 378/2205= 6/35
2 1/3* 4 1/5= 7/3*21/5= 49/5= 9 4/5
1 1/2*0,5= 3/2*1/2= 3/4= 0,75
0,7-1/2= 0,7-0,5= 0,2
2,8:1/5-3,9= 28/10:1/5-39/10= 28/10*5/1-39/10= 28/2-39/10= 140/10-39/10= 101/10= 10 1/10
(3/5+1/10)*(0,8-1/4)= (6/10+1/10)*(8/10-1/4)= 7/10*(32/40-10/40)= 7/10*22/40= 77/200= 0,385
