801,4-(74-525,35:7,9)•(64,4-6,88:8,6)

Question

801,4-(74-525,35:7,9)•(64,4-6,88:8,6)

Answer 1

 801,4-(74-525,35:7,9)•(64,4-6,88:8,6)=324.4

Answer 2

1)525,35:7,9=66,5

2)74-66,5=7,5

3)6,88:8,6=0,8

4)64,4-0,8=63,6

5)7,5*63,6=477

6)801,4-477=324,4