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> 计算:(1)45-515-1220;(2)已知x=2-10,求代数式x2-4x-6的值.-数学
计算:(1)45-515-1220;(2)已知x=2-10,求代数式x2-4x-6的值.-数学
题目简介
计算:(1)45-515-1220;(2)已知x=2-10,求代数式x2-4x-6的值.-数学
题目详情
计算:
(1)
45
-5
1
5
-
1
2
20
;
(2)已知x=2-
10
,求代数式x
2
-4x-6的值.
题型:解答题
难度:中档
来源:不详
答案
(1)原式=3
5
-
5
-
5
=
5
;
(2)原式=(x-2)2-10,
=(2-
10
-2)2-10
=10-10
=0.
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题目简介
计算:(1)45-515-1220;(2)已知x=2-10,求代数式x2-4x-6的值.-数学
题目详情
(1)
(2)已知x=2-
答案
=
(2)原式=(x-2)2-10,
=(2-
=10-10
=0.