试题
题目:
计算:
(1)
3
3
×
(-
1
3
)
3
-2÷
(-
1
2
)
3
(2)(-4)
2
÷(-2)
3
-(-7)
(3)(-1)
4
-[(-2)
3
-(-3)
3
]÷(-19)
(4)
(-1
3
5
)
2
÷(-
3
5
)×(-
5
12
)
(5)
-1
4
-
1
3
[2-(-3
)
2
]
(6)
(-1)
2010
+
(-4)
2010
×
(-
1
4
)
2009
(7)
-3
2
+
(-2
1
2
)
2
×(-
4
25
)+|
-2
2
|
(8)[-5
3
-(-3)
3
]÷[(-5)-(-3)].
答案
解:(1)
3
3
×
(-
1
3
)
3
-2÷
(-
1
2
)
3
=27×(-
1
27
)-2÷(-
1
8
)
=-1+16
=15;
(2)(-4)
2
÷(-2)
3
-(-7)
=16÷(-8)+7
=-2+7
=5;
(3)(-1)
4
-[(-2)
3
-(-3)
3
]÷(-19)
=1-[-8+27]÷(-19)
=1-19÷(-19)
=1+1
=2;
(4)
(-1
3
5
)
2
÷(-
3
5
)×(-
5
12
)
=
64
25
×
5
3
×
5
12
=
16
9
;
(5)
-1
4
-
1
3
[2-(-3
)
2
]
=-1-
1
3
×[2-9]
=-1-
1
3
×[-7]
=-1+
7
3
=
4
3
;
(6)
(-1)
2010
+
(-4)
2010
×
(-
1
4
)
2009
=1+(-4)×[(-4)×(-
1
4
)]
2009
=1+(-4))×1
2009
=1+(-4)×1
=1-4
=-3;
(7)
-3
2
+
(-2
1
2
)
2
×(-
4
25
)+|
-2
2
|
=-9+
25
4
×(-
4
25
)+4
=-9-1+4
=-6;
(8)[-5
3
-(-3)
3
]÷[(-5)-(-3)]
=[-125+27]÷(-2)
=98÷2
=49.
解:(1)
3
3
×
(-
1
3
)
3
-2÷
(-
1
2
)
3
=27×(-
1
27
)-2÷(-
1
8
)
=-1+16
=15;
(2)(-4)
2
÷(-2)
3
-(-7)
=16÷(-8)+7
=-2+7
=5;
(3)(-1)
4
-[(-2)
3
-(-3)
3
]÷(-19)
=1-[-8+27]÷(-19)
=1-19÷(-19)
=1+1
=2;
(4)
(-1
3
5
)
2
÷(-
3
5
)×(-
5
12
)
=
64
25
×
5
3
×
5
12
=
16
9
;
(5)
-1
4
-
1
3
[2-(-3
)
2
]
=-1-
1
3
×[2-9]
=-1-
1
3
×[-7]
=-1+
7
3
=
4
3
;
(6)
(-1)
2010
+
(-4)
2010
×
(-
1
4
)
2009
=1+(-4)×[(-4)×(-
1
4
)]
2009
=1+(-4))×1
2009
=1+(-4)×1
=1-4
=-3;
(7)
-3
2
+
(-2
1
2
)
2
×(-
4
25
)+|
-2
2
|
=-9+
25
4
×(-
4
25
)+4
=-9-1+4
=-6;
(8)[-5
3
-(-3)
3
]÷[(-5)-(-3)]
=[-125+27]÷(-2)
=98÷2
=49.
考点梳理
考点
分析
点评
有理数的混合运算.
按照有理数混合运算的顺序,先乘方后乘除最后算加减,有括号的先算括号里面的.
本题考查的是有理数的运算能力.注意:
(1)要正确掌握运算顺序,在混合运算中要特别注意运算顺序:先三级,后二级,再一级;有括号的先算括号里面的;同级运算按从左到右的顺序;
(2)去括号法则:--得+,-+得-,++得+,+-得-.
找相似题
计算:
(1)
(-2)÷[(-
1
2
)
2
×(
1
2
)
3
]×|-
25
4
|-(-5)
;
(2)-(-1)
2005
+4÷(-2)-|-1
2
|.
计算下列各式的值:
(1)
0.25×(-2
)
3
-[4÷(-
2
3
)
2
+1]+(-1
)
2008
;
(2)(
7
9
-
5
6
+
3
4
-
7
18
)×(-36).
计算:
-
1
4
-(
7
3
-
11
17
-
14
15
)×(-五五)÷(-1
)
7五五9
计算:
①
(
1
6
-
1
8
+
1
12
)÷(-
1
24
)
;
②-2
2
-(-2)
2
+(-3)
2
×(-
2
3
)-4
2
÷|-4|.
①计算:(+12)+(-23)-(-33)
②计算:
-
2
2
-16÷(-4)×(-
3
4
)