Question

(6 3/4-2,9)*4+(7 5/8-3,25):7/8

Answer 1

1) 6 3/4 - 2,9 = 6 3/4 - 2 9/10 = 6 15/20 - 2 18/20 = 5 35/20 - 2 18/20 = 3 17/20 
2) 3 17/20 * 4 = 77/20 * 4 = 77/5 = 15,4 
3) 7 5/8 - 3,25 = 7 5/8 - 3 1/4 = 7 5/8 - 3 2/8 = 4 3/8 
4) 4 3/8 : 7/8 = 35/8 * 8/7 = 5 
5) 15,4 + 5 = 20,4

Answer 2

(6 3/4-2,9)*4+(7 5/8-3,25):7/8=20 2/5

1)6 3/4-2 9/10=4 15/20-18/20=
3 35/20-18/20=3 17/20

2)77/20*4/1=77/5=15 2/5

3)7 5/8-3 1/4=4 10/16-4/16=4 6/16

4)4 6/16:7/8=70/16*8/7=10/2=5

5)77/5+5=15 2/5+5=20 2/5

Answer 3

20 2/5=20,4