题目内容
计算:
(1)4
+(-6
)+(+1
)+(-1
)
(2)(-3)-(-1.5)-(-3)+(+3.5)
(3)(-1)÷(-4
)×2
(4)(-
-
+
)÷(-
)
(5)-14-
×[2-(-3)2]
(6)|
-
|+|
-
|+…+|
-1|.
(1)4
| 2 |
| 5 |
| 1 |
| 4 |
| 1 |
| 4 |
| 2 |
| 5 |
(2)(-3)-(-1.5)-(-3)+(+3.5)
(3)(-1)÷(-4
| 2 |
| 3 |
| 4 |
| 5 |
(4)(-
| 3 |
| 4 |
| 5 |
| 9 |
| 7 |
| 12 |
| 1 |
| 36 |
(5)-14-
| 1 |
| 6 |
(6)|
| 1 |
| 2012 |
| 1 |
| 2011 |
| 1 |
| 2011 |
| 1 |
| 2010 |
| 1 |
| 2 |
考点:有理数的混合运算
专题:
分析:(1)利用加法交换律与结合律简算;
(2)先化简,再分类计算;
(3)先判定符号,再把带分化为假分数简算;
(4)把除法改为乘法,利用乘法分配律简算;
(5)先算乘方,再算括号里面的减法,再算乘法,最后算减法;
(6)先算绝对值,再进一步计算即可.
(2)先化简,再分类计算;
(3)先判定符号,再把带分化为假分数简算;
(4)把除法改为乘法,利用乘法分配律简算;
(5)先算乘方,再算括号里面的减法,再算乘法,最后算减法;
(6)先算绝对值,再进一步计算即可.
解答:解:(1)4
+(-6
)+(+1
)+(-1
)
=4
-1
-6
+1
=3-5
=-2;
(2)(-3)-(-1.5)-(-3)+(+3.5)
=-3+1.5+3+3.5
=5;
(3)(-1)÷(-4
)×2
=1×
×
=
;
(4)(-
-
+
)÷(-
)
=(-
-
+
)×(-36)
=-
×(-36)-
×(-36)+
×(-36)
=27+20-21
=26;
(5)-14-
×[2-(-3)2]
=-1-
×[2-9]
=-1+
=
;
(6)|
-
|+|
-
|+…+|
-1|
=1-
+
-
+…+
-
+
-
=1-
=
.
| 2 |
| 5 |
| 1 |
| 4 |
| 1 |
| 4 |
| 2 |
| 5 |
=4
| 2 |
| 5 |
| 2 |
| 5 |
| 1 |
| 4 |
| 1 |
| 4 |
=3-5
=-2;
(2)(-3)-(-1.5)-(-3)+(+3.5)
=-3+1.5+3+3.5
=5;
(3)(-1)÷(-4
| 2 |
| 3 |
| 4 |
| 5 |
=1×
| 3 |
| 14 |
| 14 |
| 5 |
=
| 3 |
| 5 |
(4)(-
| 3 |
| 4 |
| 5 |
| 9 |
| 7 |
| 12 |
| 1 |
| 36 |
=(-
| 3 |
| 4 |
| 5 |
| 9 |
| 7 |
| 12 |
=-
| 3 |
| 4 |
| 5 |
| 9 |
| 7 |
| 12 |
=27+20-21
=26;
(5)-14-
| 1 |
| 6 |
=-1-
| 1 |
| 6 |
=-1+
| 7 |
| 6 |
=
| 1 |
| 6 |
(6)|
| 1 |
| 2012 |
| 1 |
| 2011 |
| 1 |
| 2011 |
| 1 |
| 2010 |
| 1 |
| 2 |
=1-
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 2010 |
| 1 |
| 2011 |
| 1 |
| 2011 |
| 1 |
| 2012 |
=1-
| 1 |
| 2012 |
=
| 2011 |
| 2012 |
点评:此题考查有理数的混合运算,注意运算顺序与计算符号,合理运用运算定律简算.
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