计算(1)(1+根号x)(1-根号x)(2)(根号a+根号b)(-根号a-根号b)

问题描述:

计算(1)(1+根号x)(1-根号x)(2)(根号a+根号b)(-根号a-根号b)

(1)(1+√X)(1-√X)
=1²-(√X)²
=1-X
(2)(√a+√b)(-√a-√b)
=(√a+√b)[-(√a+√b)]
=-(√a+√b)²
=-[a+(2√ab)+b]
=-a-(2√ab)-b