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> 设,则代数式的值为().A.-6B.24C.D.-八年级数学
设,则代数式的值为().A.-6B.24C.D.-八年级数学
题目简介
设,则代数式的值为().A.-6B.24C.D.-八年级数学
题目详情
设
,则代数式
的值为( ).
A.-6
B.24
C.
D.
题型:单选题
难度:中档
来源:不详
答案
A
∵
∴当
时,原式=(
-1+1)2-13=7-13,
=-6.
故选A.
本题考查了完全平方公式
上一篇 :
计算—的结果是A.6B.C.2D.-八年级
下一篇 :
的值等于(▲).A.3B.C.D.-九年级数学
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题目简介
设,则代数式的值为().A.-6B.24C.D.-八年级数学
题目详情
答案
∴当
=-6.
故选A.
本题考查了完全平方公式