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> (1)计算(-12)-2-23*0.125+20100-|-1|;(2)先化简,再求值:m+1m2-m+41-m2(m+3)(m-1)m+3,其中m=-12.-数学
(1)计算(-12)-2-23*0.125+20100-|-1|;(2)先化简,再求值:m+1m2-m+41-m2(m+3)(m-1)m+3,其中m=-12.-数学
题目简介
(1)计算(-12)-2-23*0.125+20100-|-1|;(2)先化简,再求值:m+1m2-m+41-m2(m+3)(m-1)m+3,其中m=-12.-数学
题目详情
(1)计算
(-
1
2
)
-2
-
2
3
*0.125+201
0
0
-|-1|
;
(2)先化简,再求值:
m+1
m
2
-m
+
4
1-
m
2
(m+3)(m-1)
m+3
,其中m=
-
1
2
.
题型:解答题
难度:中档
来源:不详
答案
(1)原式=4-8×0.125+1-1=4-1+1-1=3;
(2)原式=
(m+1
)
2
-4m
m(m+1)(m-1)
(m+3)(m-1)
m+3
=
(m-1
)
2
m(m+1)
,
当m=-
class="stub"1
2
时,原式=
(-
class="stub"1
2
-1
)
2
(-
class="stub"1
2
)×(-
class="stub"1
2
+1)
=-9.
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题目简介
(1)计算(-12)-2-23*0.125+20100-|-1|;(2)先化简,再求值:m+1m2-m+41-m2(m+3)(m-1)m+3,其中m=-12.-数学
题目详情
(2)先化简,再求值:
答案
(2)原式=
当m=-