(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=(
x2-1
x-1
-class="stub"15
x-1
)÷class="stub"x-4
x-1

=
x2-16
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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