(3-2根号2)x^2+2(根号2-1)x-3=0

2024-12-21 18:39:54
推荐回答(2个)
回答1:

解:3-2根号2
=2-2根号2+1
=(根号2-1)^2
(3-2根号2)x^2+2(根号2-1)x-3=0
[(根号2-1)x]^2+2(根号2-1)x+1-4=0
[(根号2-1)x+1]^2-4=0
[(根号2-1)x+3][(根号2-1)x-1]=0
(根号2-1)x=1或-3
x=(根号2+1)或(-3根号2-3)

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回答2:

[(√2-1)x]²+2(√2-1)x-3=0
[(√2-1)x+3][(√2-1)x-1]=0
(√2-1)x+3=0, (√2-1)x-1=0
x=-3(√2+1) x=√2+1
=-3√2-3