Question

80-((4÷5×7+0,64)×(1,25×7-4÷5×1,25)+31,64)

Answer 1

4/5*7=28/5=5,6
5,6+0,64=6,24
1,25*(7-0,8)=1,25*6,2=7,75
6,24*7,75=48,36
48,36+31,64=80
80-80=0