Question

一题高一数学选择题～急

[(3+√7)^5 ][(3-√7)^5]
不用计算机，按照多元多项式的分解法写出步骤。

Answer 1

(3+√7)^5 *(3-√7)^5
=[(3+√7) (3-√7)]^5
=(9-7)^5
=2^5
=32

Answer 2

原式=[(3+√7)(3-√7)]^5 =[3^2 -(√7)^2]^5=2^5=32