(1+根号2-根号3)(1-根号2+根号3)=?

问题描述:

(1+根号2-根号3)(1-根号2+根号3)=?

(1+根号2-根号3)(1-根号2+根号3)
=(1+根号2-根号3)(1-(根号2-根号3))
=1-(根号2-根号3)^2
=-4+2根号6

你好,纷飞红雪幻 :

此题利用平方差公式:
(1+√2-√3)(1-√2+√3)
=[1+(√2-√3)][1-(√2-√3)]
=1²-(√2-√3)²
=1-(2+3-2√6)
=1-5+2√6
=2√6-4