"Too easy" 英文可以说为 "That's too easy" 或者 "That's a piece of cake."
"Piece of cake" 这个短语来源于20世纪20年代，当时常用来形容任务或工作非常简单容易。
例句：
That math problem was too easy. It was a piece of cake.
I thought the test would be difficult, but it was a piece of cake.
翻译：
那道数学题太简单了，就像吃蛋糕一样。
我原以为这次考试会很难，但其实很简单，就像吃蛋糕一样。