关于x的多项式5x³+kx²-1+2x²-x中若不含x²项,字母k的值是( ).1.关于x的多项式5x³+kx²-1+2x²-x中若不含x²项,字母k的值是( 2.若单项式4x^m与-x^2y^n-1的和是单项式,则m=( )
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![关于x的多项式5x³+kx²-1+2x²-x中若不含x²项,字母k的值是( ).1.关于x的多项式5x³+kx²-1+2x²-x中若不含x²项,字母k的值是( 2.若单项式4x^m与-x^2y^n-1的和是单项式,则m=( )](/uploads/image/z/6853450-58-0.jpg?t=%E5%85%B3%E4%BA%8Ex%E7%9A%84%E5%A4%9A%E9%A1%B9%E5%BC%8F5x%26%23179%3B%2Bkx%26%23178%3B-1%2B2x%26%23178%3B-x%E4%B8%AD%E8%8B%A5%E4%B8%8D%E5%90%ABx%26%23178%3B%E9%A1%B9%2C%E5%AD%97%E6%AF%8Dk%E7%9A%84%E5%80%BC%E6%98%AF%EF%BC%88+%EF%BC%89.1.%E5%85%B3%E4%BA%8Ex%E7%9A%84%E5%A4%9A%E9%A1%B9%E5%BC%8F5x%26%23179%3B%2Bkx%26%23178%3B-1%2B2x%26%23178%3B-x%E4%B8%AD%E8%8B%A5%E4%B8%8D%E5%90%ABx%26%23178%3B%E9%A1%B9%2C%E5%AD%97%E6%AF%8Dk%E7%9A%84%E5%80%BC%E6%98%AF%EF%BC%88+2.%E8%8B%A5%E5%8D%95%E9%A1%B9%E5%BC%8F4x%5Em%E4%B8%8E-x%5E2y%5En-1%E7%9A%84%E5%92%8C%E6%98%AF%E5%8D%95%E9%A1%B9%E5%BC%8F%EF%BC%8C%E5%88%99m%3D%28+%29)
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关于x的多项式5x³+kx²-1+2x²-x中若不含x²项,字母k的值是( ).1.关于x的多项式5x³+kx²-1+2x²-x中若不含x²项,字母k的值是( 2.若单项式4x^m与-x^2y^n-1的和是单项式,则m=( )
关于x的多项式5x³+kx²-1+2x²-x中若不含x²项,字母k的值是( ).
1.关于x的多项式5x³+kx²-1+2x²-x中若不含x²项,字母k的值是(
2.若单项式4x^m与-x^2y^n-1的和是单项式,则m=( ) n=( ).
关于x的多项式5x³+kx²-1+2x²-x中若不含x²项,字母k的值是( ).1.关于x的多项式5x³+kx²-1+2x²-x中若不含x²项,字母k的值是( 2.若单项式4x^m与-x^2y^n-1的和是单项式,则m=( )
5x³+kx²-1+2x²-x
=5x³+(k+2)x²-x-1
∵多项式中不含x²项
∴k+2=0
∴k=-2
2.若单项式4x^m与-x^2y^n-1的和是单项式,则m=( ) n=( ).
∵和为单项式
∴它们一定是同类项,可以合并.
即:m=2,n-1=0
∴m=2 n=1
-2
-2
合并同类项kx²+2x²=(k+2)x²,不含x²项,就说明k+2=0,所以k就等于-2啊