把后边的根号二和根号三放在一起,【1+(根号2+根号3)】【1-(根号2+根号3)】=1--(根号2+根号3)的平方=1-(2+3+2倍根号6)=4-2倍根号六
用平方差公式(a+b)(a-b)=a^2-b^2计算
(1+根号2+根号3)(1-根号2-根号3)
=1-(根号2+根号3)^2
=1-2-3+2根号6
=2根号6-4
PS:a^2表示a平方
(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=1-2-3-2根号6=-4-2根号
(1+根号2+根号3)(1-根号2-根号3)
=[1+(√2+√3)][1-(√2+√3)]
=1²-(√2+√3)²
=1-(2+3-2√6)
=2√6-4