两道有关代数式的题若多项式6mx²+4nxy+2x+2xy-x²+y+4不含x²项和xy项,则6m-2n+2的值为( )已知y=ax5(是5次方)+bx³+cx-1,当x=-2时,y=5,那么当x=2时,y的值是( )
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/22 03:46:18
![两道有关代数式的题若多项式6mx²+4nxy+2x+2xy-x²+y+4不含x²项和xy项,则6m-2n+2的值为( )已知y=ax5(是5次方)+bx³+cx-1,当x=-2时,y=5,那么当x=2时,y的值是( )](/uploads/image/z/12974143-31-3.jpg?t=%E4%B8%A4%E9%81%93%E6%9C%89%E5%85%B3%E4%BB%A3%E6%95%B0%E5%BC%8F%E7%9A%84%E9%A2%98%E8%8B%A5%E5%A4%9A%E9%A1%B9%E5%BC%8F6mx%26sup2%3B%2B4nxy%2B2x%2B2xy-x%26sup2%3B%2By%2B4%E4%B8%8D%E5%90%ABx%26sup2%3B%E9%A1%B9%E5%92%8Cxy%E9%A1%B9%2C%E5%88%996m-2n%2B2%E7%9A%84%E5%80%BC%E4%B8%BA%EF%BC%88+%EF%BC%89%E5%B7%B2%E7%9F%A5y%3Dax5%EF%BC%88%E6%98%AF5%E6%AC%A1%E6%96%B9%EF%BC%89%2Bbx%26sup3%3B%2Bcx-1%2C%E5%BD%93x%3D-2%E6%97%B6%2Cy%3D5%2C%E9%82%A3%E4%B9%88%E5%BD%93x%3D2%E6%97%B6%2Cy%E7%9A%84%E5%80%BC%E6%98%AF%EF%BC%88+%EF%BC%89)
两道有关代数式的题若多项式6mx²+4nxy+2x+2xy-x²+y+4不含x²项和xy项,则6m-2n+2的值为( )已知y=ax5(是5次方)+bx³+cx-1,当x=-2时,y=5,那么当x=2时,y的值是( )
两道有关代数式的题
若多项式6mx²+4nxy+2x+2xy-x²+y+4不含x²项和xy项,则6m-2n+2的值为( )
已知y=ax5(是5次方)+bx³+cx-1,当x=-2时,y=5,那么当x=2时,y的值是( )
两道有关代数式的题若多项式6mx²+4nxy+2x+2xy-x²+y+4不含x²项和xy项,则6m-2n+2的值为( )已知y=ax5(是5次方)+bx³+cx-1,当x=-2时,y=5,那么当x=2时,y的值是( )
6mx²+4nxy+2x+2xy-x²+y+4
=(6m-1)x²+(4n+2)xy+2x+y+4
题目中不含x²和xy,则它们的系数为0
6m-1=0,6m=1
4n+2=0,2n=-1
因此值为1-(-1)+2=4
(2)因为式子中X的指数都是奇数,互为相反数的奇数次方也互为相反数
当X=-2时,ax5+bx³+cx-1=5,ax5+bx³+cx=6
当X=2时,ax5+bx³+cx-1=-6-1=-7
若多项式6mx²+4nxy+2x+2xy-x²+y+4不含x²项和xy项,则6m-2n+2的值为( )
合并同类项:(6m-1)x²+(4n+2)xy+2x+y+4 因为不含x²项和xy项。所以得(6m-1)=0 (4n+2)=0 得m=1/6 n=-1/2 代入6m-2n+2=4
已知y=ax5(是5次方)+bx&su...
全部展开
若多项式6mx²+4nxy+2x+2xy-x²+y+4不含x²项和xy项,则6m-2n+2的值为( )
合并同类项:(6m-1)x²+(4n+2)xy+2x+y+4 因为不含x²项和xy项。所以得(6m-1)=0 (4n+2)=0 得m=1/6 n=-1/2 代入6m-2n+2=4
已知y=ax5(是5次方)+bx³+cx-1,当x=-2时,y=5,那么当x=2时,y的值是( )
收起