已知㎡-5m-1=0,求m^4+1/㎡的值速求

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已知㎡-5m-1=0,求m^4+1/㎡的值速求已知㎡-5m-1=0,求m^4+1/㎡的值速求已知㎡-5m-1=0,求m^4+1/㎡的值速求m²-1=5m两边平方m^4-2m²+1=

已知㎡-5m-1=0,求m^4+1/㎡的值速求
已知㎡-5m-1=0,求m^4+1/㎡的值
速求

已知㎡-5m-1=0,求m^4+1/㎡的值速求
m²-1=5m
两边平方
m^4-2m²+1=25m²
m^4+1=27m²
(m^4+1)/m²=27

⑴-3xy^2-6x^2y
=-3xy(x+2y)
⑵(x+y)^2-4xy
=x^2+2xy+y^2-4xy
=x^2-2xy+y^2
=(x-y)^2
⑶(a+b)^2-16(a-b)^2
=(a+b)^2-(4a-4b)^2
=(a+b+4a-4b)(a+b-4a+4b)
=(5a-3b)(5b-3a)
⑷a^4-4a^2b^2+4b^4
=(a^2-2b^2)^2
⑸2x^2-7x+3
=2x^2-x-6x+3
=x(2x-1)-3(2x-1)
=(2x-1)(x-3)

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