妈妈今年C岁,儿子(C﹣24)岁,再过b年后,妈妈与儿子的年龄相差 岁.
==36÷ = (填小数)
18: =0.25= %= ÷24=.
2.5==50÷ = ÷50.
6: = %=0.25= ÷48= (填分数)
4÷5= = = = ÷80.