(根号7+2-2根号3)(根号7-2+2根号3)

(根号7+2-2根号3)(根号7-2+2根号3)
(根号7+2-2根号3)(根号7-2+2根号3)

(根号7+2-2根号3)(根号7-2+2根号3)
=[√7+(2-2√3)][√7-(2-2√3)]
=(√7)²-(2-2√3) ²
=7-(4-8√3+12)
=8√3 -9

(根号7+2-2根号3)(根号7-2+2根号3)
=根号7的平方-（2-2根号3)的平方
=7-（4-8根号3+12)
=7-16+8根号3
=8根号3-9

-9+8根号3