计算:(3+2√5)²-(4+√5)(4-√5)

计算:(3+2√5)²-(4+√5)(4-√5)
计算:(3+2√5)²-(4+√5)(4-√5)

计算:(3+2√5)²-(4+√5)(4-√5)
解(3+2√5)^2-(4+√5)(4-√5)
=9+12√5+20-(4^2-(√5)^2)
=9+12√5+20-(16-5)
=9+12√5+20-11
=18+12√5
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解(3+2√5)^2-(4+√5)(4-√5)
=9+12√5+20-(4^2-(√5)^2)
=9+12√5+20-(16-5)
=9+12√5+20-11
=18+12√5可不可以发图片