_________-3(x^2-2b)=2x^2-bm^4-2m^2n^2-2m^2+2n^2+n^4=m^4-2m^2n^2-()+n^4多项式5x^2y-15x^2y^2与12xy^2+23x^2y^2-x^2的差是——若ab=-2,a-b=1/4,则(ab-4a)+a-3b的值为
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![_________-3(x^2-2b)=2x^2-bm^4-2m^2n^2-2m^2+2n^2+n^4=m^4-2m^2n^2-()+n^4多项式5x^2y-15x^2y^2与12xy^2+23x^2y^2-x^2的差是——若ab=-2,a-b=1/4,则(ab-4a)+a-3b的值为](/uploads/image/z/10227346-34-6.jpg?t=_________-3%28x%5E2-2b%29%3D2x%5E2-bm%5E4-2m%5E2n%5E2-2m%5E2%2B2n%5E2%2Bn%5E4%3Dm%5E4-2m%5E2n%5E2-%28%29%2Bn%5E4%E5%A4%9A%E9%A1%B9%E5%BC%8F5x%5E2y-15x%5E2y%5E2%E4%B8%8E12xy%5E2%2B23x%5E2y%5E2-x%5E2%E7%9A%84%E5%B7%AE%E6%98%AF%E2%80%94%E2%80%94%E8%8B%A5ab%3D-2%2Ca-b%3D1%2F4%2C%E5%88%99%EF%BC%88ab-4a%EF%BC%89%2Ba-3b%E7%9A%84%E5%80%BC%E4%B8%BA)
_________-3(x^2-2b)=2x^2-bm^4-2m^2n^2-2m^2+2n^2+n^4=m^4-2m^2n^2-()+n^4多项式5x^2y-15x^2y^2与12xy^2+23x^2y^2-x^2的差是——若ab=-2,a-b=1/4,则(ab-4a)+a-3b的值为
_________-3(x^2-2b)=2x^2-b
m^4-2m^2n^2-2m^2+2n^2+n^4=m^4-2m^2n^2-()+n^4
多项式5x^2y-15x^2y^2与12xy^2+23x^2y^2-x^2的差是——
若ab=-2,a-b=1/4,则(ab-4a)+a-3b的值为
_________-3(x^2-2b)=2x^2-bm^4-2m^2n^2-2m^2+2n^2+n^4=m^4-2m^2n^2-()+n^4多项式5x^2y-15x^2y^2与12xy^2+23x^2y^2-x^2的差是——若ab=-2,a-b=1/4,则(ab-4a)+a-3b的值为
(1)
__5x²-7b___-3(x^2-2b)=2x^2-b
2x^2-b+3(x^2-2b)=2x²-b+3x²-6b=5x²-7b
(2)
m^4-2m^2n^2-2m^2+2n^2+n^4=m^4-2m^2n^2-( 2m²-2n² )+n^4
(3)
多项式5x^2y-15x^2y^2与12xy^2+23x^2y^2-x^2的差是5x^2y-38x^2y^2-12xy^2+x^2
5x^2y-15x^2y^2-(12xy^2+23x^2y^2-x^2)
=5x^2y-15x^2y^2-12xy^2-23x^2y^2+x^2
=5x^2y-38x^2y^2-12xy^2+x^2
(4)
若ab=-2,a-b=1/4,则(ab-4a)+a-3b的值为
(a+b)²=(a-b)²+4ab=1/16-8
( 5x^-7b ) -3(x^2-2b)=2x^2-b
m^4-2m^2n^2-2m^2+2n^2+n^4=m^4-2m^2n^2-( 2m^2-2n^2 )+n^4
5x^2y-15x^2y^2-(12xy^2+23x^2y^2-x^2)=5x^2y-12xy^2-28x^2y^2+x^2
ab=-2
a-b=1/4
(ab-4a)+a-3b=