试题

题目:
计算:
(1)(-5
1
2
)×3
1
3

(2)-2
1
5
×2
3
11
÷(-2
1
2

(3)(1
3
7
-
7
5
+
7
12
)÷(-
1
27
)

(7)(-
1
27
)
÷(1
3
7
-
7
5
+
7
12

(5)79
27
25
×(-5)
(6)(-29
2
7
)
÷(-5)
答案
解:(3)原式=-
33
2
×
30
3

=-
55
3


(2)原式=-
33
5
×
25
33
×(-
2
5

=2;

(3)原式=(3
3
4
-
7
e
+
7
32
)×(-24)
=-42+23-34
=-35;

(4)原式=-
3
24
÷
35
24

=-
3
24
×
24
35

=-
3
35


(5)原式=(50-
3
25
)×(-5)
=-250+
3
5

=-249
4
5


(6)原式=(-30+
5
7
)×(-
3
5

=6-
3
7

=5
6
7

解:(3)原式=-
33
2
×
30
3

=-
55
3


(2)原式=-
33
5
×
25
33
×(-
2
5

=2;

(3)原式=(3
3
4
-
7
e
+
7
32
)×(-24)
=-42+23-34
=-35;

(4)原式=-
3
24
÷
35
24

=-
3
24
×
24
35

=-
3
35


(5)原式=(50-
3
25
)×(-5)
=-250+
3
5

=-249
4
5


(6)原式=(-30+
5
7
)×(-
3
5

=6-
3
7

=5
6
7
考点梳理
有理数的除法;有理数的乘法.
原式各项利用除法法则变形,再计算乘法法则计算即可得到结果.
此题考查了有理数的乘除法,熟练掌握运算法则是解本题的关键.
计算题.
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