整式的加减 (15 17:26:8)已知Y=a*x^5+b*x^3+c*x-5,当X=-3时,Y=7,那么X=3时,求Y的值
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![整式的加减 (15 17:26:8)已知Y=a*x^5+b*x^3+c*x-5,当X=-3时,Y=7,那么X=3时,求Y的值](/uploads/image/z/5262046-70-6.jpg?t=%E6%95%B4%E5%BC%8F%E7%9A%84%E5%8A%A0%E5%87%8F+%2815+17%3A26%3A8%29%E5%B7%B2%E7%9F%A5Y%3Da%2Ax%5E5%2Bb%2Ax%5E3%2Bc%2Ax-5%2C%E5%BD%93X%3D-3%E6%97%B6%2CY%3D7%2C%E9%82%A3%E4%B9%88X%3D3%E6%97%B6%2C%E6%B1%82Y%E7%9A%84%E5%80%BC)
整式的加减 (15 17:26:8)已知Y=a*x^5+b*x^3+c*x-5,当X=-3时,Y=7,那么X=3时,求Y的值
整式的加减 (15 17:26:8)
已知Y=a*x^5+b*x^3+c*x-5,当X=-3时,Y=7,那么X=3时,求Y的值
整式的加减 (15 17:26:8)已知Y=a*x^5+b*x^3+c*x-5,当X=-3时,Y=7,那么X=3时,求Y的值
X=-3时
y=a*(-3)^5+b*(-3)^3-3c-5
=-(a*3^5+b*3^3+3c)-5
=7
a*3^5+b*3^3+3c=-12
x=3时
y=a*3^5+b*3^3+3c-5=-12-5=-17
a*(-3)^5+b*(-3)^3+c*(-3)-5=7
a*3^5+b*3^3+c*3=-12
a*3^5+b*3^3+c*3-5=-17
X=3时,Y=-17
x=-3时
y=-3^5a-3^3b-3c-5=7
那么3^5a+3^3b+3c=-12
x=3时
y=3^5a+3^3b+3c-5
=-12-5
=-17
-17
a*x^5+b*x^3+c*x是奇函数,x=-3时的值与x=3的值互为相反数,x=-3时y=7,
a*x^5+b*x^3+c*x为12,则x=3时值为-12,带入Y=a*x^5+b*x^3+c*x-5就得-17