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歡迎您訪問數(shù)學(xué)考題練習(xí):當(dāng)x=-2時,代數(shù)式1-x+x2的值_____!

數(shù)學(xué)考題練習(xí):當(dāng)x=-2時,代數(shù)式1-x+x2的值_____

更新時間:2024-01-12 16:42:46作者:貝語網(wǎng)校

當(dāng)x=-2時,代數(shù)式1-x+x2的值________.

試題答案

7

試題解析

根據(jù)已知直接將x=-2代入原式求出即可.

解答:∵x=-2,

∴1-x+x2=1-(-2)+(-2)2

=1+2+4,

=7.

故答案為:7.

點評:此題主要考查了代數(shù)式求值,根據(jù)已知直接代入即可,注意計算認(rèn)真此題易在計算上出現(xiàn)錯誤.

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