(3+2根号2)乘以(3-2根号2)

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(3+2根号2)乘以(3-2根号2)(3+2根号2)乘以(3-2根号2)(3+2根号2)乘以(3-2根号2)(3+2根号2)乘以(3-2根号2)=3^2-(2根号2)^2=9-8=1所用的公式(a+b

(3+2根号2)乘以(3-2根号2)
(3+2根号2)乘以(3-2根号2)

(3+2根号2)乘以(3-2根号2)
(3+2根号2)乘以(3-2根号2)
=3^2-(2根号2)^2
=9-8
=1
所用的公式(a+b)(a-b)=a^2-b^2