2m^3-4m^2+2m 因式分解若x+y=0,xy=-7,则x^2y+xy^2= ,x^2+y^2=已知a+b=2,ab=2,则2分之1a^3b+a^2b^2+2分之1ab^3=已知a+b=-5,ab=7,则a^2b+ab^2-a-b=化简:(-2)^2n+1+2(-2)^2n

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2m^3-4m^2+2m 因式分解若x+y=0,xy=-7,则x^2y+xy^2=    ,x^2+y^2=已知a+b=2,ab=2,则2分之1a^3b+a^2b^2+2分之1ab^3=已知a+b=-5,ab=7,则a^2b+ab^2-a-b=化简:(-2)^2n+1+2(-2)^2n
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2m^3-4m^2+2m 因式分解若x+y=0,xy=-7,则x^2y+xy^2= ,x^2+y^2=已知a+b=2,ab=2,则2分之1a^3b+a^2b^2+2分之1ab^3=已知a+b=-5,ab=7,则a^2b+ab^2-a-b=化简:(-2)^2n+1+2(-2)^2n
2m^3-4m^2+2m 因式分解
若x+y=0,xy=-7,则x^2y+xy^2= ,x^2+y^2=
已知a+b=2,ab=2,则2分之1a^3b+a^2b^2+2分之1ab^3=
已知a+b=-5,ab=7,则a^2b+ab^2-a-b=
化简:(-2)^2n+1+2(-2)^2n

2m^3-4m^2+2m 因式分解若x+y=0,xy=-7,则x^2y+xy^2= ,x^2+y^2=已知a+b=2,ab=2,则2分之1a^3b+a^2b^2+2分之1ab^3=已知a+b=-5,ab=7,则a^2b+ab^2-a-b=化简:(-2)^2n+1+2(-2)^2n
若x+y=0,xy=-7,则
x^2y+xy^2
=xy(x+y)=0 ,
x^2+y^2=(x+y)²-2xy
=14
已知a+b=2,ab=2,则
2分之1a^3b+a^2b^2+2分之1ab^3
=1/2ab(a²+2ab+b²)
=1/2ab(a+b)²
=1/2*2*2²
=4
已知a+b=-5,ab=7,则
a^2b+ab^2-a-b
=ab(a+b)-(a+b)
=-35+5
=-30
(-2)^2n+1+2(-2)^2n
=-2^(2n+1)+2*2^2n
=-2^(2n+1)+2^(2n+1)
=0