You might very well have done some very accurate math but it doesn't matter, because you did the math in the wrong place.

你可能很好地做完了一些很精确地数学运算,但是没有关系，因为你没有做错,数学运算。

哈佛公开课 - 计算机科学课程节选

It actually doesn't do anything at the end of the day because I am performing this math.

实际上，最终它什么都不会做,因为我在演算这个算术。

哈佛公开课 - 计算机科学课程节选

Because the math doesn't back up their words, which is frequently the case.

WHITEHOUSE: Press Briefing by Press Secretary Jay Carney,

"I know the pundits, and I know what they say: The math doesn't work out, " Huckabee said Saturday morning at the Conservative Political Action Conference in Washington.

CNN: McCain gets mixed message; Dems deadlocked after contests

When Governor Romney and his allies tell us we can somehow lower our deficit by spending trillions more on new tax breaks skewed towards the wealthy, the math doesn't work.

WHITEHOUSE: The White House