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> (1)计算:8-2sin45°+(2-π)0;(2)化简(x2+4x-4)÷x2-4x2+2x,并选择一个你认为合适的整数x代入求值.-数学
(1)计算:8-2sin45°+(2-π)0;(2)化简(x2+4x-4)÷x2-4x2+2x,并选择一个你认为合适的整数x代入求值.-数学
题目简介
(1)计算:8-2sin45°+(2-π)0;(2)化简(x2+4x-4)÷x2-4x2+2x,并选择一个你认为合适的整数x代入求值.-数学
题目详情
(1)计算:
8
-2sin45°+(2-π)
0
;
(2)化简
(
x
2
+4
x
-4)
÷
x
2
-4
x
2
+2x
,并选择一个你认为合适的整数x代入求值.
题型:解答题
难度:中档
来源:不详
答案
原式=2
2
-2×
2
2
+1=
2
+1;
(2)原式=
(
x-2)
2
x
•
x(x+2)
(x+2)(x-2)
=x-2,
当x=1时,原式=1-2=-1.
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题目简介
(1)计算:8-2sin45°+(2-π)0;(2)化简(x2+4x-4)÷x2-4x2+2x,并选择一个你认为合适的整数x代入求值.-数学
题目详情
(2)化简(
答案
(2)原式=
当x=1时,原式=1-2=-1.