在实数范围内分解因式x^(4)+y^(4)
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发布时间:2022-05-31 04:43
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时间:2023-10-09 06:47
1.
x⁴+y⁴
=x⁴+2x²y²+x⁴-2x²y²
=(x²+y²)-2x²y²
=(x²+√2xy+y²)(x²-√2xy+y²)
2.
x⁴-y⁴
=(x²+y²)(x²-y²)
=(x²+y²)(x+y)(x-y)
3.
√(4-√15)
=√[(8-2√15)/2]
=√[(√5)²+(√3)²-2√3√5)/2]
=√[(√5-√3)²/2]
=(√5-√3)/√2
=(√10-√6)/2