把7.4的小数点向左移动两位是0.74. .
3:8=24÷ = %
:10== ÷20= %=0.7=.
= ÷ === (小数)= (百分数)= (成数)
0.16==2÷ =8: = %
0.75==6÷( )=12:( )=( )%