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> 求代数式的值:x2-2xx2-4+(x-2-2x-4x+2),其中x=2+2.-数学
求代数式的值:x2-2xx2-4+(x-2-2x-4x+2),其中x=2+2.-数学
题目简介
求代数式的值:x2-2xx2-4+(x-2-2x-4x+2),其中x=2+2.-数学
题目详情
求代数式的值:
x
2
-2x
x
2
-4
+(x-2-
2x-4
x+2
)
,其中x=2+
2
.
题型:解答题
难度:中档
来源:恩施州
答案
原式=
x
2
-2x
x
2
-4
+
x
2
-4-2x+4
x+2
=
class="stub"x
x+2
+
x
2
-2x
x+2
=
x
2
-x
x+2
;
当x=2+
2
时,
原式=
(2+
2
)
2
-(2+
2
)
2+
2
+2
=
4
2
+5
7
.
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题目简介
求代数式的值:x2-2xx2-4+(x-2-2x-4x+2),其中x=2+2.-数学
题目详情
答案
=
=
当x=2+
原式=