no 12 help................

12. 3 3/4 - 5/6 - 0,8 - 0,25

15/4 - 5/6 - 8/10 - 25/100

15×6×10×100/4×6×10×100 - 5×4×10×100/6×4×10×100 - 8×6×4×100/10×6×4×100 - 25×10×6×4/100×10×6×4


90.000/24.000 - 20.000/24.000 - 19.200/24.000 - 6.000/24.000

44.800÷100/24.000÷100

448÷8/240÷8

56÷2/30÷2

28/15

1 13/15 (c)

3 3/4=15/4
15/4-5/6-4/5-1/4
=14/4-5/6-4/5
=420/120- 100/120- 96/120
=224/120=1 104/120=1 13/15kg
jwb=c.1 13/15