求值、急!A=(5m+1)(x^2)+(3n-2)xy-5x+17yB=6(x^2)-5mxy-11x+9当A与B的差不含二次项时,求[(-1)^(m+n)]{-3m+4n-[(-n)^m]}
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![求值、急!A=(5m+1)(x^2)+(3n-2)xy-5x+17yB=6(x^2)-5mxy-11x+9当A与B的差不含二次项时,求[(-1)^(m+n)]{-3m+4n-[(-n)^m]}](/uploads/image/z/8839677-21-7.jpg?t=%E6%B1%82%E5%80%BC%E3%80%81%E6%80%A5%21A%3D%285m%2B1%29%28x%5E2%29%2B%283n-2%29xy-5x%2B17yB%3D6%28x%5E2%29-5mxy-11x%2B9%E5%BD%93A%E4%B8%8EB%E7%9A%84%E5%B7%AE%E4%B8%8D%E5%90%AB%E4%BA%8C%E6%AC%A1%E9%A1%B9%E6%97%B6%2C%E6%B1%82%5B%28-1%29%5E%28m%2Bn%29%5D%7B-3m%2B4n-%5B%28-n%29%5Em%5D%7D)
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求值、急!A=(5m+1)(x^2)+(3n-2)xy-5x+17yB=6(x^2)-5mxy-11x+9当A与B的差不含二次项时,求[(-1)^(m+n)]{-3m+4n-[(-n)^m]}
求值、急!
A=(5m+1)(x^2)+(3n-2)xy-5x+17y
B=6(x^2)-5mxy-11x+9
当A与B的差不含二次项时,
求[(-1)^(m+n)]{-3m+4n-[(-n)^m]}
求值、急!A=(5m+1)(x^2)+(3n-2)xy-5x+17yB=6(x^2)-5mxy-11x+9当A与B的差不含二次项时,求[(-1)^(m+n)]{-3m+4n-[(-n)^m]}
A=(5m+1)(x^2)+(3n-2)xy-5x+17y
B=6(x^2)-5mxy-11x+9
A-B=(5m-5)x^2+(3n-2+5m)xy+6x+17y-9
因为不含二次项
则5m-5=0 3n-2+5m=0
m=1 n=-1
[(-1)^(m+n)]{-3m+4n-[(-n)^m]}
=1*(-3-4+1)
=-6