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> 化简,再求值:-,其中a=(结果精确到0.01)-九年级数学
化简,再求值:-,其中a=(结果精确到0.01)-九年级数学
题目简介
化简,再求值:-,其中a=(结果精确到0.01)-九年级数学
题目详情
化简,再求值:
-
,其中a=
(结果精确到0.01)
题型:计算题
难度:中档
来源:福建省中考真题
答案
解:原式=
=
=
=a(a-1)=a2-a,
∴当x=
时,原式=(
)2-
=5-
≈2.76。
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计算:。-九年级数学
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计算:()。-七年级数学
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题目简介
化简,再求值:-,其中a=(结果精确到0.01)-九年级数学
题目详情
答案
∴当x=