an unknown quantity造句

1、an equation in which the highest power of an unknown quantity is a square.
未知量的最高幂是平方的等式。

2、an equation in which the highest power of an unknown quantity is a square
未知量的最高幂是平方的等式。

3、The Frenchman was an unknown quantity when he arrived in north London back in 1996.
1996年，当他初到北伦敦时，这个法国人还只不过是个未知数而已。