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> (1)化简:+;(2)先化简,再求值:,其中a=1.-八年级数学
(1)化简:+;(2)先化简,再求值:,其中a=1.-八年级数学
题目简介
(1)化简:+;(2)先化简,再求值:,其中a=1.-八年级数学
题目详情
(1)化简:
+
;
(2)先化简,再求值:
,其中a=1.
题型:计算题
难度:中档
来源:河北省期末题
答案
解:(1)原式=
+
﹣5
=3
+
×2
﹣5×
=
=
;
(2)原式=
﹣
=
﹣
=
;
当a=1时,原式=﹣
.
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题目简介
(1)化简:+;(2)先化简,再求值:,其中a=1.-八年级数学
题目详情
(2)先化简,再求值:
答案
=3
=
=
(2)原式=
=
=
当a=1时,原式=﹣