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> (1)计算:8+(-1)3-2×22+(π-1)0.(2)先化简再求值:3x-3x2-1÷3xx+1-1x-1,其中x=2.-数学
(1)计算:8+(-1)3-2×22+(π-1)0.(2)先化简再求值:3x-3x2-1÷3xx+1-1x-1,其中x=2.-数学
题目简介
(1)计算:8+(-1)3-2×22+(π-1)0.(2)先化简再求值:3x-3x2-1÷3xx+1-1x-1,其中x=2.-数学
题目详情
(1)计算:
8
+(-1)
3
-2×
2
2
+(π-1)
0
.
(2)先化简再求值:
3x-3
x
2
-1
÷
3x
x+1
-
1
x-1
,其中x=2.
题型:解答题
难度:中档
来源:不详
答案
(1)原式=
2
2
-1-
2
+1
=
2
;
(2)原式=
class="stub"-1
x
2
-x
,
当x=2时,原式=
-
class="stub"1
2
.
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题目简介
(1)计算:8+(-1)3-2×22+(π-1)0.(2)先化简再求值:3x-3x2-1÷3xx+1-1x-1,其中x=2.-数学
题目详情
(2)先化简再求值:
答案
=
(2)原式=
当x=2时,原式=-