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> (1)计算:|3-1|+2-2-2sin60°+(π-2010)0.(2)先化简,再求值:(x+1-15x-1)÷x-4x-1,其中x=52-4.-数学
(1)计算:|3-1|+2-2-2sin60°+(π-2010)0.(2)先化简,再求值:(x+1-15x-1)÷x-4x-1,其中x=52-4.-数学
题目简介
(1)计算:|3-1|+2-2-2sin60°+(π-2010)0.(2)先化简,再求值:(x+1-15x-1)÷x-4x-1,其中x=52-4.-数学
题目详情
(1)计算:|
3
-1|+2
-2
-2sin60°+(π-2010)
0
.
(2)先化简,再求值:(x+1-
15
x-1
)÷
x-4
x-1
,其中x=5
2
-4.
题型:解答题
难度:中档
来源:海门市二模
答案
(1)原式=
3
-1+
class="stub"1
4
-2×
3
2
+1=
class="stub"1
4
;
(2)原式=(
x
2
-1
x-1
-
class="stub"15
x-1
)÷
class="stub"x-4
x-1
,
=
x
2
-16
x-1
-
class="stub"x-1
x-4
,
=
(x-4)(x+4)
x-1
-
class="stub"x-1
x-4
,
=x+4.
当x=5
2
-4时,原式=5
2
-4+4=5
2
.
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题目简介
(1)计算:|3-1|+2-2-2sin60°+(π-2010)0.(2)先化简,再求值:(x+1-15x-1)÷x-4x-1,其中x=52-4.-数学
题目详情
(2)先化简,再求值:(x+1-
答案
(2)原式=(
=
=
=x+4.
当x=5