9班数学

多项式

练习2.2第一部分

问题1:求多项式的值
' 5x - 4x²+ 3 ' at:

(我)' x = 0 '

答:给定' p(x) = 5x - 4x^2 + 3 '

因此,' p(0) = 5xx 0 - 4xx 0^2 + 3 '

或者,' p(0) = 0 - 0 + 3 = 3 '



(2)' x = - 1 '

答:给定' p(x) = 5x - 4x^2 + 3 '

因此,' p(-1) = 5xx (-1) - 4xx (-1)^2 + 3 '

或者,' p(-1) = - 5 - 4 + 3 = - 6 '

(3)' x = 2 '

答:给定' p(x) = 5x - 4x^2 + 3 '

因此,' p(2) = 5 × 2 - 4 × 2^2 + 3 '

或者,' p(2) = 10 - 8 + 3 = 5 '

(iv)' x = 3 '

答:给定' p(x) = 5x - 4x^2 + 3 '

因此,' p(3) = 5xx 3 - 4xx 3^2 + 3 '

或者,' p(3) = 15 - 36 + 3 = - 18 '

(v)' x = - 2 '

答:给定' p(x) = 5x - 4x^2 + 3 '

因此,' p(-2) = 5xx (-2) - 4xx (-2)^2 + 3 '

或者,' p(-2) = - 10 - 16 + 3 = - 23 '



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