1、若m²-5m+2=0,则2014-2m²+10m=?2、x-【2x-y】=?;【-2a】²/a=;【-m+2n】【m+2n】=
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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】=
1、若m²-5m+2=0,则2014-2m²+10m=?
2、x-【2x-y】=?;【-2a】²/a=;【-m+2n】【m+2n】=
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
m²-5m=-2∴原式=2014-2(m²-5m)=2014-2×(-2)=2018 -x+y; -4a; 4n²-m²
1、2014-2m²+10m=2014-2(m²+5m+2)+4=2014-2×0+4=2018
2、x-(2x-y)=x-2x+y=-x+y
(-2a)²/a=(4a²)/a=4a
(-m+2n)(m+2n)=(2n)²-m²=4n²-m²