（1）5x+0.2=0.6
5x+0.2-0.2=0.6-0.2
5x÷5=0.4÷5
x=0.08
（2）5x+0.2＞0.6
5x+0.2-0.2＞0.6-0.2
5x÷5＞0.4÷5
x＞0.08．
答：当x的值为0.08时，5x+0.2的值为0.6；当x的值大于0.08时，5x+0.2的值大于0.6．
故答案为：0.08，大于0.08．