口算。4÷2= 10÷5=

口算。4÷2=                      10÷5=                       8÷2=                   12÷4=     3÷3=                      4÷4=                         9÷3=                   12÷6=     4÷2=                      5÷1=                         8÷4=                    l÷l=
0.39