a÷b=6(a、b是非零的自然数),那么a和b的最大公因数是6. .
=0.25=4÷ = :28= %
12÷ ==== %= 折.
5: ==1.25=30÷ = %
1==3÷ = : = %= (填小数).
=2: =4÷ = %=0.4.