8 ÷ 8 ÷ 8 ÷ 8 ÷ 8 = 1
dou是÷号
(8-8）÷8+8÷8=1（8+8）÷8-8÷8=1（8+8）÷8+8-8=2（8+8）÷8+8÷8=38-8*8÷(8+8)=48-(8+8+8)÷8=5
