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> (1)计算:(2011+1)0+(12)-1-2×(-3);(2)先化简(1+4a2-4)•a+2a,然后从0,1,2中选取一个你认为合适的数作为a的值代入求值.-数学
(1)计算:(2011+1)0+(12)-1-2×(-3);(2)先化简(1+4a2-4)•a+2a,然后从0,1,2中选取一个你认为合适的数作为a的值代入求值.-数学
题目简介
(1)计算:(2011+1)0+(12)-1-2×(-3);(2)先化简(1+4a2-4)•a+2a,然后从0,1,2中选取一个你认为合适的数作为a的值代入求值.-数学
题目详情
(1)计算:
(
2011
+1
)
0
+(
1
2
)
-1
-2×(-3)
;
(2)先化简
(1+
4
a
2
-4
)
•
a+2
a
,然后从0,1,2中选取一个你认为合适的数作为a的值代入求值.
题型:解答题
难度:中档
来源:不详
答案
(1)原式=1+2+6=9;
(2)原式=
a
2
(a+2)(a-2)
•
class="stub"a+2
a
=
class="stub"a
a-2
.
∵a(a+2)(a-2)≠0,
∴a≠0,a≠2且a≠-2.
∴当a=1时,原式=
class="stub"1
1-2
=-1
.
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计算:20的结果是______.-数学
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题目简介
(1)计算:(2011+1)0+(12)-1-2×(-3);(2)先化简(1+4a2-4)•a+2a,然后从0,1,2中选取一个你认为合适的数作为a的值代入求值.-数学
题目详情
(2)先化简(1+
答案
(2)原式=
∵a(a+2)(a-2)≠0,
∴a≠0,a≠2且a≠-2.
∴当a=1时,原式=