1、若m²-5m+2=0,则2014-2m²+10m=?

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1、若m²-5m+2=0,则2014-2m²+10m=?
2、x-【2x-y】=?；【-2a】²/a=；【-m+2n】【m+2n】=

解
m²-5m+2=0
m²-5m=-2
2014-2m²+10m
=2014-2×(m²-5m)
=2014-2×(-2)
=2014+4
=2018
x-(2x-y)
=x-2x+y
=-x+y
(-2a)²/a
=(4a²)/a
=4a
(-m+2n)(m+2n)
=(2n)²-m²
=4n²-m²

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