试题
题目:
计算
(1)0×(-2008)×2009+(-1)÷(-2)
(2)
(-32)×(
3
16
-
5
8
+
7
4
-
1
32
)
(3)
-
5
2
+
28
5
÷(-2)×(-
5
14
)
(4)-2
4
+3×(-1)
4
-(-4)×5.
答案
解:(1)原式=0+0.5
=0.5;
(2)原式=(-32)×
3
16
-(-32)×
5
8
+(-32)×
7
4
-(-32)×
1
32
=-6-(-20)-56-(-1)
=-6+20-56+1
=-41;
(3)原式=-
5
2
+
28
5
×
1
2
×
5
14
=-
5
2
+1
=-
3
2
;
(4)原式=-16+3×1-(-20)
=-16+3+20
=7.
解:(1)原式=0+0.5
=0.5;
(2)原式=(-32)×
3
16
-(-32)×
5
8
+(-32)×
7
4
-(-32)×
1
32
=-6-(-20)-56-(-1)
=-6+20-56+1
=-41;
(3)原式=-
5
2
+
28
5
×
1
2
×
5
14
=-
5
2
+1
=-
3
2
;
(4)原式=-16+3×1-(-20)
=-16+3+20
=7.
考点梳理
考点
分析
点评
有理数的混合运算.
(1)先算乘法和除法,再算加法;
(2)利用乘法分配律简算;
(3)先算乘除混合运算,再算加法;
(4)先算乘方,再算乘法,最后算加减.
此题考查有理数的混合运算,注意运算顺序,抓住数字特点,灵活简算.
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
)