Question

7цiлихи-4/9 ,10цiлих-3цiлих 9/10, 7/8-3/4 , 3/4-3/10

Answer 1

63/9-4/9=59/9=6 5/9
100/10-39/10=61/10=6 1/10=6,1
7/8-3/4=7/8-6/8=1/2
3/4-3/10=15/20-6/20=9/20

Answer 2

7 целых - 4/9 = 63/9 - 4/9 = 59/9

10 целых - 3 целых + 9/10 = 10 - 3 + 9/10 = 7 + 9/10 = 70/10 + 9/10 = 79/10

7/8 - 3/4 = (7*4)/(8*4) - (3*2)/(4*2) = 28/32 - 6/32 = 22/32 = 11/16

3/4 - 3/10 = (3*10)/(4*10) - (3*4)/(10*4) = 30/40 - 12/40 = 18/40 = 9/20