两个数的差是15.8,如果被减数减少3,减数增加3,它们的差不变. .
=0.4==12÷ = %= :25.
= (小数)= (百分数)=12: = 折.
0.75== ÷16=27: = %.
= : =33÷ = %
÷4=25%= : =8÷ = 折.