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> 计算:①(32+0.5-213)-(18-75);②若a是5的小数部分,求a2-1a-1-a2-2a+1a2-a的值.-数学
计算:①(32+0.5-213)-(18-75);②若a是5的小数部分,求a2-1a-1-a2-2a+1a2-a的值.-数学
题目简介
计算:①(32+0.5-213)-(18-75);②若a是5的小数部分,求a2-1a-1-a2-2a+1a2-a的值.-数学
题目详情
计算:
①
(
32
+
0.5
-2
1
3
)-(
1
8
-
75
)
;
②若
a是
5
的小数部分,求
a
2
-1
a-1
-
a
2
-2a+1
a
2
-a
的值.
题型:解答题
难度:中档
来源:不详
答案
①原式=4
2
+
2
2
-
2
3
3
-
2
4
+5
3
=
17
2
4
+
13
3
3
;
②∵
a是
5
的小数部分,
∴a=
5
-2
,
∴a-1<0
∴原式=a+1+
class="stub"1
a
=
5
-2+1+
class="stub"1
5
-2
=
5
-1+
5
+2
=
2
5
+1
.
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题目简介
计算:①(32+0.5-213)-(18-75);②若a是5的小数部分,求a2-1a-1-a2-2a+1a2-a的值.-数学
题目详情
①(
②若a是
答案
②∵a是
∴a=
∴a-1<0
∴原式=a+1+