精英家教网 > 初中数学 > 题目详情
先化简,再求值:(每小题6分,共12分)
(1),其中x =" –" 2;
(2),其中

(1)-12
(2)-95解析:

(1) 解:原式

··································································· 3分
x =" –" 2时,原式··································· 4分
······························································ 6分
(2) 解:原式····························· 2分

········································································ 4分

原式 
··············································································· 6分
练习册系列答案
相关习题

科目:初中数学 来源: 题型:

 先化简,再求值:(每小题6分,共12分)

(1),其中=-3;

(2)-x2+[3xy2(4x2-8xy2)+x2]-7xy2,其中x=-,y=-2011.

 

查看答案和解析>>

科目:初中数学 来源: 题型:

先化简,再求值:(每小题7分,共14分)
(1),其中
(2),其中

查看答案和解析>>

科目:初中数学 来源:2011-2012年浙江省温岭市七年级第一学期四校期中联考数学卷 题型:解答题

 先化简,再求值:(每小题6分,共12分)

(1),其中=-3;

(2)-x2+[3xy2(4x2-8xy2)+x2]-7xy2,其中x=-,y=-2011.

 

查看答案和解析>>

科目:初中数学 来源:2010年高级中等学校招生考试数学卷(福建宁德) 题型:解答题

先化简,再求值:(每小题7分,共14分)

(1),其中

(2),其中

 

查看答案和解析>>

同步练习册答案