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> 先化简:,再从1,2,3中选一个你认为合适的数作为a的值代入求值。-九年级数学
先化简:,再从1,2,3中选一个你认为合适的数作为a的值代入求值。-九年级数学
题目简介
先化简:,再从1,2,3中选一个你认为合适的数作为a的值代入求值。-九年级数学
题目详情
先化简:
,再从1,2,3中选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:湖南省中考真题
答案
解:原式=
=
=
,
∵a≠1,a≠-1,a≠0,
∴在1,2,3中,a只能取2或3
当a=2时,原式=
;
当a=3时,原式=
。
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先化简,再求值:,其中x=-3。-九年
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题目简介
先化简:,再从1,2,3中选一个你认为合适的数作为a的值代入求值。-九年级数学
题目详情
答案
=
∵a≠1,a≠-1,a≠0,
∴在1,2,3中,a只能取2或3
当a=2时,原式=
当a=3时,原式=