等式

gāi děng shì duì yú rèn hé dà yú èr de shù zhí dōu bù chéng lì

该等式对于任何大于二的数值都不成立。

The equation is impossible for any value of n greater than two.

děng shì zhōng de hé dōu shì wèi zhī shù

等式中的X和Y都是未知数。

X and Y in the equation are both unknowns.